OPINION
Derek Barr, Roger Craig White, and Chris Nicole White (“Plaintiffs-Appellants”), students at William Blount High School (“the school”) in Blount County, Tennessee, would like to express their southern heritage by wearing clothing depicting the Confederate flag at school. They appeal the district court’s grant of summary judgment to the principal of their school, Steven Lafon (“Lafon”), the director of the Blount County schools, Alvin Hord (“Hord”), and the Blount County School Board 1 on their First Amendment, Equal Protection Clause, and Due Process Clause claims.
I. FACTS AND PROCEDURE
A. Factual Background
1. Written Dress Code
The Blount County Board of Education issued a dress code on December 4, 2003 in recognition of “the effect that student dress and grooming have upon student behavior and learning.” Joint Appendix (“J.A.”) at 155 (Hord Aff. Ex. 1 at 1). Among other prohibitions, the dress code bars middle-and high-school students from wearing during the school day:
clothing which exhibits written, pictorial, or implied references to illegal substances, drugs or alcohol, negative slogans, vulgarities, or causes disruption to the educational process; wearing apparel that is sexually suggestive or that features crude or vulgar commercial lettering or printing and/or pictures that *557 depict drugs, tobacco, alcohol beverages, racial/ethnic slurs or gang affiliation....
J.A. at 156 (Hord Aff. Ex. 1 at ¶ 4(f)) (emphasis added). On the first day of the 2005-2006 school year, in keeping with school policy, students attended a meeting at which they received a “[planner” containing an agenda and school rules. Students’ home-room teachers reviewed the planner with them, and the school asked both parents and students to sign a page of the planner indicating that they had read the policy. J.A. at 102 (Lafon Dep. at 26:19-27:7).
2. Announcement of the Ban on Clothing Displaying the Confederate Flag
At an assembly for the freshman class in August 2005, Principal Lafon told the class that “they would not be allowed to have Rebel flags or symbols of [the] Rebel flag on their clothing, or anything else that was a disruption to the school.” J.A. at 102 (Lafon Dep. at 28:10-12). Lafon testified at his deposition that he did not mention any other flags as similarly banned because there were not “any other flags at that point that were causing disruption or that we knew had caused a disruption in the previous year.” J.A. at 102 (Lafon Dep. at 28:17-23). Lafon told the students that “in general ... anything that is a disruption to the school learning environment would not be tolerated.” J.A. at 103 (Lafon Dep. at 29:5-9).
3. Rationale for the Ban on the Confederate Flag and Racially Divisive Symbols
According to Hord, racial tensions at the school comprised the context for the clothing ban. Relevant incidents included racist graffiti that made general threats against the lives of African-Americans, graffiti containing “hit lists” of specific students’ names, physical altercations between African-American and white students, and a police lockdown at the school. J.A. at 53-54 (Hord Aff. 3/10/06 at ¶¶ 3-4); J.A. at 111, 113-14, 115-16 (Hord Dep. at 17-18, 25-31, 36-39). Hord attests that “[biased upon the aforementioned incidents, the wearing of the ‘Confederate flag’ by students during school hours has a significant disruptive effect on the proper educational environment of the students at the Blount County high school.” J.A. at 54 (Hord Aff. 3/10/06 at ¶ 5). Of the approximately 1,750 students attending the school, less than ten percent are African-American. J.A. at 153 (Hord Aff. 4/3/07 at ¶10).
a. February 22, 2005 Altercation and other Altercations
Both sides in the instant case cite an incident that occurred on February 22, 2005 as the catalyst of heightened racial tension in the school. Barr recounted his observation of the incident. According to Barr, the incident involved a physical altercation at a basketball game in the gym, between an African-American student (whose name Barr did not know) and a Caucasian student named J.H. J.A. at 235 (Barr Dep. at 8:12-20). Barr did not remember exactly what the argument was about. J.A. at 235 (Barr Dep. at 8:21-23). Barr indicated that a third “racist” white student named C.P. “didn’t like what the African-American kid was saying, and they got into it.” J.A. at 235-36 (Barr Dep. at 8:24-9:3). The African-American student rounded up a group of friends, and Barr joined a “couple of other kids ... because [J.H.] was our friend and we didn’t want to see him getting jumped by anybody.” J.A. at 236 (Barr Dep. at 9:3-9). Before a physical altercation began, “the teachers and everybody got down there and split them up and everything like that and told them to go to class. And *558 from then on there was a tight racist thing going on in the school.” J.A. at 236 (Barr Dep. at 9:10-13). Barr testified that by “tight racist thing,” he meant that the African-American students “tried to find anything they could to get” Caucasian students “in trouble.” J.A. at 236 (Barr Dep. at 9:15-20).
The incident resulted in the parent of the African-American student involved in the February 22 altercation, whom the school suspended, filing a complaint with the Office of Civil Rights (“OCR”) at the Department of Education alleging that the complainant’s son received harsher discipline than a white student who did not receive a suspension. J.A. at 111 (Hord Dep. at 17-18); J.A. at 289 (OCR Letter at 1). OCR investigated the incident and concluded “that the witnesses did not substantiate the allegations that Student #2 [a Caucasian student] engaged in fighting. All witnesses stated that Student # 2 had not pulled back when Student # 1 pushed him into the bleachers.” J.A. at 291 (OCR Letter at 3). 2 Furthermore, OCR concluded although “[t]he complainant reported that the two [Caucasian] HHS students threatened, used racial slurs or intimidating conduct (noose gestures) against [her son, African-American] Student # 1 [,] ... that allegation was not corroborated by witnesses.” Id.
In addition to the February 22 incident, Hord attests that the school experienced “multiple racially motivated threats and physical altercations,” but Hord does not specifically describe other physical altercations. J.A. at 53 (Hord Aff. 3/10/06 at ¶ 3(b)). Hord mentioned at his deposition an incident in January 2005 involving a mixed-race step team that he believed contributed to racial tensions at the school. J.A. at 111 (17:7-16).
b. Racist Graffiti and “Hit Lists”
In the spring of 2005, the school experienced multiple incidents of racist graffiti and graffiti containing “hit lists” with students’ names. On March 23, 2005, School Resource Officer and Deputy Sheriff Joe Crisp investigated graffiti in the girls’ restroom after an Assistant Principal at the school contacted him. J.A. at 183 (Crisp Aff. at ¶ 2). He did not take pictures because the custodians had painted over the graffiti before he arrived; however, he filed an incident report with the Sheriffs Office. J.A. at 183 (Crisp Aff. at ¶2). According to his report, the Assistant Principal told him that the phrase “all niggers must die” was accompanied by a list with future victims’ names. J.A. at 188 (Incident Report).
Another incident involving racist graffiti occurred on April 1, 2005; the principal of the school contacted Crisp to ask him to investigate racial remarks on a restroom stall. J.A. at 183 (Crisp Aff. at ¶ 3). Crisp took pictures, J.A. at 377-384 (Photographs), and filed an incident report. J.A. at 183 (Crisp Aff. at ¶ 3); J.A. at 191 (Incident Report). Four days later, on April 5, 2005, Crisp took photographs of graffiti in a boys’ restroom, J.A. at 202; the graffiti stated: “All niggers will still *559 die on 4 — 13—05[.] It’s time for a new revolution!.] KKK.” J.A. at 184 (Crisp Aff. at ¶ 4); J.A. at 386 (Crisp Aff. Ex. 4). Deputy Sheriff Andy Waters took photographs of the graffiti in a boys restroom in the vocational wing of the school. J.A. at 392-411 (Photographs); J.A. at 206 (Investigative Report). The graffiti included the scrawled statements: “The South Will Rise Again,” J.A. at 398-99 (Waters Aff. Ex. 2), and “Niggers ‘Hang em,’ ” written above a drawing of a noose next to the Confederate flag. J.A. at 404-09 (Waters Aff. Ex. 2).
The graffiti included a “hit list” with students’ names. J.A. at 113-14 (Hord Dep. at 25-31); J.A. at 367 (Crisp Aff. at ¶ 2); J.A. at 369-72 (Crisp Aff. Ex. 1). Hord testified that he was not certain whether all the names on the list were those of minority students. J.A. at 114 (Hord Dep. at 29). Deputy Sheriff David Henderson stated in his report that the graffiti threatened “rednecks” as well as African-Americans. J.A. at 231 (Henderson Report). Plaintiff-Appellant Barr testified that the list was on paper and was shown to various students. J.A. at 238 (Barr Dep. at 11:19-24). Barr testified that “it wasn’t just Caucasian kids doing it.” J.A. at 238 (Barr Dep. at 11:7-8). He testified that he knew “a lot” of the people on the list, some Caucasian and some African-American. J.A. at 239 (Barr Dep. at 12:2-7).
c. Lockdown
After a meeting with representatives from the Sheriffs Department and an FBI agent, Hord decided to implement a lock-down at the school in early April 2005 3 to “be proactive” and “show that the school [was] secure and it [was] safe and we [were] interested in keeping it that way.” J.A. at 54 (Hord Aff. 3/10/06 at ¶ 4); J.A. at 115 (Hord Dep. at 36:20-22); J.A. at 117-18 (Hord Dep. at 44:24-45:2) (reiterating the need to demonstrate that the school was safe and free of guns). Hord pointed out that there had been “threats to bring guns, to hang people, to do all of this stuff. I had been accused by some people of not taking this seriously].” J.A. at 115 (Hord Dep. at 36:17-19). One parent Hord remembered in particular, John Cleveland, called Hord because his daughter had been called racially derogatory names, threatened because of her race, and “exposed to being taunted by the [Rebel] flag or something to that nature.” J.A. at 116 (Hord Dep. at 40:4-7, 20). Hord was concerned about violence. J.A. at 116 (Hord Dep. at 37:15-16).
The Sheriffs Office “maintained a continued presence,” J.A. at 228 (Henderson Aff. at ¶ 3), at the school on April 7-8, 2005. The office assigned “approximately 40-50 officers” “to secure” the high school and “investigate racial incidents.” J.A. at 228 (Henderson Aff. at ¶ 3). Officer Waters “checked purses and backpacks at the school entrance as part of the security assigned” to the school. J.A. at 204 (Waters Aff. at ¶ 3). “The investigation did not reveal any suspects for the graffiti, racial threats!,] or racial slurs.” J.A. at 184 (Crisp Aff. at ¶ 5). One student, J.H., “was charged and delivered to the Blount County Juvenile Detention Center after he admitted that he stated that he and his friends were going to bring a gun to school and kill all African American students and other people they did not like.” J.A. at 184 (Crisp Aff. at ¶ 5).
*560 d. Hord’s Conclusions Regarding the Disruptive Effect of the Confederate Flag
Hord attests that in making the decision to ban the Confederate flag and other “racially divisive symbols,” he “relied upon numerous conversations with students and parents of students which revealed that students were taunted by the Confederate flag and were fearful for their safety as a result of the racial tensions at William Blount High School.” J.A. at 152 (Hord Aff. 4/3/07 at ¶ 5). Hord further attests that “[t]he parents’ and the students’ fears were evidenced by a dramatic increase in absenteeism during the time of racial tension prior to the lockdown and the ban.” Id.
Hord characterized the Confederate flag as both offensive and disruptive: “I think when that offense becomes something that you have to deal with day-in and day-out [] it is disruptive to what our normal process is, yes.” J.A. at 115 (Hord Dep. at 34:6-8); see also J.A. at 112 (Hord Dep. at 21:7-16). Hord believed that student offense as a result of the flag would lead to disruption. J.A. at 122-23 (Hord Dep. at 64:18-65:2). Hord stated that he was not banning the Confederate flag because it was a “racist symbol”: he based the continued ban on the events that began in January 2005 and information that he continues to gain
that says to me, when you have it, you have disruption, you have — you have interference with the learning process. And you have hurt feelings and you have people that are offended and it is something that we have to deal with. My primary purpose is to take us forward instructionally and that prohibits that and you’re worried about the insecurity and safety and all of those things rather than the instruction process.
J.A. at 115 (Hord Dep. at 33:5-16). Lafon believed that were the ban lifted, the Confederate flag “would be a source of confrontation and a symbol that would cause unrest with the student body.” J.A. at 99 (Lafon Dep. at 14: 19-20). Lafon also believed that the presence of the flag would lead to racially motivated physical altercations. J.A. at 99 (Lafon Dep. at 14:23-24). Hord, however, stated in his deposition that he intended “at this point” to keep the ban in place, even if appearances of the Confederate flag (despite the ban) did not cause disruption. J.A. at 121 (Hord Dep. at 59:9-60:10).
4. Enforcement of the Ban on Racially Divisive Symbols
According to Lafon, between August 2005 and March 2006, the school witnessed “over 452 documented violations of the dress code policy ... twenty-three (23) of which involved the wearing of the ‘Confederate flag’ by students.” J.A. at 51 (Lafon Aff. at ¶ 4). Plaintiff-Appellant Barr declares:
On or about September 1, 2005, to express pride in my southern heritage, I wore a T-shirt to school bearing a small image of the Confederate flag, a picture of two dogs, and the words “Guarding our Southern Heritage” on the back. I was confronted by Defendant Lafon. Prior to my encounter with Mr. Lafon, no student or teacher had commented on my shirt that day. I was informed by Mr. Lafon that items displaying the Confederate flag were banned at William Blount High School. Defendant Lafon informed me that I had to turn the shirt inside out or take it off. Lafon informed me that if I refused to remove the shirt I would be suspended from school.
J.A. at 26-27 (Barr Deck at ¶ 4). Plaintiff-Appellant Chris White declares that she “wore a shirt with an image of the *561 Confederate flag to school” in January-2006. J.A. at 24 (Chris White Decl. at ¶4). 4 A teacher told Chris White “that the shirt violated school policy because of the image of the flag.” J.A. at 24-25 (Chris White Decl. at ¶ 4). The teacher told Chris White “to cover the shirt with a jacket for the rest of the day or return home and be suspended.” J.A. at 25 (Chris White Decl. at ¶ 4). We note that the declarations of Derek Barr and Chris White contained in the joint appendix are unsigned.
B. Procedural Background
On February 21, 2007, a panel of this court affirmed the district court’s denial of Plaintiffs-Appellants’ motion for a preliminary injunction in an unpublished opinion.
D.B. ex rel. Brogdon v. Lafon,
II. ANALYSIS
A. Standard of Review
We review de novo the district court’s grant of summary judgment to the school.
Clay v. United Parcel Serv., Inc.,
Plaintiffs-Appellants also appeal the district court’s denial of their motion for summary judgment. “Although the denial of a motion for summary judgment is usually an interlocutory order that is not immediately appealable, where ‘an appeal from a denial of summary judgment is presented in tandem with a grant of summary judgment, this court has jurisdiction to review the propriety of the district court’s denial of summary judgment.’”
Tenn. ex rel. Wireless Income Props., LLC v. City of Chattanooga,
B. Plaintiffs-Appellants’ First Amendment Claim
1. Precedent Relevant to Student Speech in Public Schools
Plaintiffs-Appellants’ claims lead us to wrestle with a most difficult question: how to balance some students’ rights to free speech with “the rights of other students to be secure and to be let alone,”
Tinker v. Des Moines Indep. Cmty. Sch. Dist.,
The Supreme Court has made “clear that students do not ‘shed their constitutional rights to freedom of speech or expression at the schoolhouse gate.’ ”
Morse v. Frederick,
— U.S. —,
In
Tinker,
the Court considered whether a public school district violated high-school and junior-high-school students’ First Amendment rights when the district suspended students who had worn black armbands to school as an expression of their opposition to the Vietnam War. The school had implemented a ban on the wearing of armbands after learning of some students’ plans to protest the war by wearing black armbands during the holiday season in December 1965. The Court determined that because “the wearing of armbands ... was entirely divorced from actually or
*563
potentially disruptive conduct by those participating in it,” the wearing of the armbands “was closely akin to ‘pure speech.’ ”
Tinker,
In two subsequent cases, the Court qualified when the
Tinker
standard should be applied and clarified that schools did not in every situation need to justify regulation of student speech on the basis that the speech would “materially and substantially interfere with the requirements of appropriate discipline in the operation of the school.”
Tinker,
Hazelwood School District v. Kuhlmeier
involved a suit brought by former staff members of a high-school newspaper who argued that the school principal violated their First Amendment rights when he deleted two pages of the newspaper containing articles discussing students’ experiences of pregnancy and the effect of divorce on students. The Court concluded that because the school lent its name and resources to the newspaper, the
Tinker
standard did not apply to the case.
Hazelwood,
The above trilogy of cases yields three principles: (1) under
Fraser,
a school may categorically prohibit vulgar, lewd, inde
*564
cent, or plainly offensive student speech,
5
Fraser,
Tinker
governs the instant case because by wearing clothing depicting images of the Confederate flag students engage in pure speech not sponsored by the school.
Castorina,
The Court’s most recent student-speech case,
Morse v. Frederick,
does not modify our application of the
Tinker
standard to the instant case.
Morse
affirmed that “schools may regulate some speech even though the government could not censor similar speech outside the school” and that the rule stated in
Tinker
“is not the only basis for restricting student speech.”
2. Analysis under Tinker of the Ban on Clothing Depicting the Confederate Flag
As an initial matter, we must consider Plaintiffs-Appellants’ argument that much of the evidence presented by the Board, and relied upon by the district court, was hearsay. Plaintiffs-Appellants Br. at 33-37; Reply Br. at 17-21. As the Board notes, however, Plaintiffs-Appellants do not specify in their brief which evidence they consider to be hearsay; rather, Plaintiffs-Appellants refer us to documents filed at the district court level.
*565
Plaintiffs-Appellants Br. at 33 n. 6. Well-established law in this Circuit holds that “a party is not allowed to incorporate by reference into its appellate brief the documents and pleadings filed in the district court.”
Thomas M. Cooley Law Sch. v. Am. Bar Ass’n,
Plaintiffs-Appellants argue that there is no evidence “that the Confederate flag
ever
caused
any
disruption at the school,” even when worn by students during the ban. Plaintiffs-Appellants Br. at 28. Plaintiffs-Appellants’ contention that the Confederate flag itself had to cause disruption in the past for the school to justify the ban, however, “misapplies the
Tinker
standard.”
Lowery v. Euverard,
Plaintiffs-Appellants further challenge the alleged high level of racial tension at the school, no matter the cause. In particular, Plaintiffs-Appellants allege that “[t]he racial graffiti referred to by the defendants as proof of ‘racial tension’ actually caused absolutely no disruptions, implying that racial tension is not as high as claimed.” Plaintiffs-Appellants Br. at 29. Were Plaintiffs-Appellants correct and the record showed minimal evidence of prior disruption related to racial tension, then we would likely conclude that the school had little basis for anticipating disruption caused by images of the Confederate flag. *566 But the evidence on the record belies Plaintiffs-Appellants’ argument.
In deposing Hord, the attorney for Plaintiffs-Appellants tried to show that racist graffiti had not specifically caused disruption. When asked if he knew if any classes had been disrupted as a result of the graffiti, Hord stated that “[t]he only disruption I think it does have is that just by the fact that a Principal and teachers if they have those kids they are pulling kids out questioning them there, they are trying to get to the bottom of it. So in that sense it is a disruption, but I don’t know specifically here is the class, here is the kids, that kind of thing.” J.A. at 114 (Hord Dep. at 31:15-21). Hord stated that he did not know whether any fights resulted from the graffiti or “hit lists.” J.A. at 114 (Hord Dep. at 31:3-12). We are wary of concluding, however, that the racist graffiti had to cause violent disruption to the school for the school reasonably to forecast that images of the Confederate flag would cause disruption within the meaning of Tinker. There is no requirement that disruption under Tinker be violent. Hord presents uncontested testimony that investigation of the graffiti disrupted classes. Furthermore, the racist graffiti was violent in character: the graffiti contained examples of the most demeaning racial slurs, accompanied by threats against the lives of African-Americans generally, an image of a noose next to that of a Confederate flag, and “hit lists” containing specific students’ names. One might plausibly argue that such racist graffiti containing violent threats is inherently disruptive to a school environment. We do not need to reach such a conclusion today, however, because Hord presented evidence that the racist graffiti including the hit lists produced secondary disruptions. “There was a lot of school disruption because of the hit lists, parents coming to school, parents calling me, calling the administrator, calling people in the Central office and it was time consuming.” J.A. at 114 (Hord Dep. at 30:24-31:2). Hord also gave unrefuted deposition testimony that fear of racial violence caused an increase in absenteeism among African-American students, the epitome of disruption in the educational process.
Perhaps the most compelling evidence of the racial tension that existed at the school immediately prior to the clothing ban comes from Plaintiffs-Appellants’ own deposition testimony. Barr stated that he felt “friction” and “racially related tension” in the school in the spring of 2005. J.A. at 240 (Barr Dep. at 13:11, 13). He said he could “feel the intensity” as “people walk[ed] by.” J.A. at 240 (13:8-9). Craig White, another student bringing this suit, conceded in his deposition that his Confederate flag clothing could “create disruptive behavior” at school if others found his clothing “offensive.” J.A. at 261 (R. Craig White Dep. at 8:11-14).
The instant case can be distinguished from
Tinker.
In
Tinker
there were no facts in the record that would “reasonably have led school authorities to forecast substantial disruption of or material interference with school activities, and no disturbances or disorders on the school premises in fact occurred” as a result of students wearing black armbands in protest of the Vietnam War.
We do not find persuasive Plaintiffs-Appellants’ argument that the Board has “repeatedly admitted that prevention of disruption is not [its] only motive.” Appellant Br. at 27. Hord acknowledges that the disruption he anticipates arising from displays of the Confederate flag directly correlates with the offense the flag poses to some students. Hord stated at deposition: “I think when that offense becomes something that you have to deal with day-in and day-out [then] it is disruptive to what our normal process is, yes.” J.A. at 115 (Hord Dep. at 34: 6-8). That Hord determined the Confederate flag to be
offensive
to African-American and other students, however, does not negate his reasonable belief that the flag was also
disruptive
and would cause substantial and material
interference
with schoolwork and school discipline. This is not a case in which the school acted upon “undifferentiated fear or apprehension of disturbance.”
Tinker,
That there exists a relationship between the offensiveness of the Confederate flag, in the eyes of some students, and its disruptive potential does not change our holding. We note that our decision evinces greater sensitivity to the effect of the regulated speech on its student audience than that ordinarily accorded to the targets of speech in our general First Amendment jurisprudence. First Amendment standards applicable to student speech in public schools, however, are unique, and courts accord more weight in the school setting to the educational authority of the school in attending to all students’ psychological and developmental
*568
needs. Unlike in
Tinker,
Plaintiffs-Appellants’ free-speech rights “collide] with the rights of other students to be secure and to be let alone.”
Tinker,
Our holding that the school in the circumstances of this case reasonably forecast the disruptive effect of the Confederate flag accords with precedent in our circuit as well as our sister circuits. In
Melton v. Young,
Furthermore, the record in the instant case closely parallels that in
West v. Derby Unified School District No. 260,
Just as in West, in the instant case the school based its clothing ban on the existence of racial tension, threatening graffiti, reports of racially motivated confrontations, and at least one fight. The only potentially significant difference between the records in the two cases is that the February 22, 2005 fight in the instant case did not involve an image of the Confederate flag. Given binding precedent in the Sixth Circuit interpreting Tinker, however, we do not think any difference between the record in the instant case and that in West is significant enough to distinguish West. Indeed, we find West consistent with our decision in Melton and, therefore, consider West to constitute persuasive precedent. 7
*570 3. Alleged Viewpoint Discrimination
Plaintiffs-Appellants argue that the ban on clothing depicting racially divisive symbols, and specifically the ban on the Confederate flag, discriminates on the basis of viewpoint and unconstitutionally suppresses particular ideas. Plaintiffs-Appellants Br. at 19-26. In
Tinker,
the Supreme Court rested its holding striking down the defendant school’s ban on armbands on the finding that “the action of the school authorities appear[ed] to have been based upon an urgent wish to avoid the controversy which might result from the expression” rather than from reasonable “anticipation] that the wearing of the armbands would substantially interfere with the work of the school or impinge upon the rights of other students.”
Id.
at 509-10,
Our precedent interpreting the status of viewpoint-discriminatory school rules under
Tinker
is complicated. The code of conduct at issue in
Melton
explicitly prohibited images of the Confederate flag, the Confederate soldier, and the song “Dixie.”
A subsequent Sixth Circuit decision,
Castorina v. Madison County School Board,
took the view that “even if there has been racial violence that necessitates a ban on racially divisive symbols, the school does not have the authority to enforce a viewpoint-specific ban on [some] racially sensitive symbols and not others.”
Although one panel of this circuit cannot overrule a prior panel,
Salmi v. Sec’y of Health & Human Servs.,
Plaintiffs-Appellants argue that the school engages in viewpoint discrimination by banning racially divisive symbols but not racially inclusive symbols. Plaintiffs-Appellants Br. at 19-22. The Board argues that it enforces a facially neutral ban on racially divisive symbols in a nondiscriminatory manner. Defendant-Appellee
*572
Br. at 34. In
Rosenberger,
the Supreme Court illuminated the often imprecise distinction between content-based and viewpoint-discriminatory restrictions on speech. “The necessities of confining a forum to the limited and legitimate purposes for which it was created may justify the State in reserving it for certain groups or for the discussion of certain topics.”
Rosenberger,
The two sides in this litigation have presented competing paradigms for what we should view as constituting content-based and viewpoint-based regulations on speech, in the circumstances of this case. Plaintiffs-Appellants suggest that the school may restrict student speech regarding race as a general topic, but may not ban racially divisive speech while allowing racially inclusive speech. By contrast, the school suggests that the restriction on racially divisive clothing is a permissible content-based restriction and that our inquiry should be whether the clothing ban is enforced in a viewpoint-discriminatory manner.
We agree with the school. As an initial matter, Plaintiffs-Appellants’ suggested definition of “content” in this case is so abstract as to approach absurdity. Considering the salience of race to our nation’s history and contemporary political and social debates, any public school would seriously hamper its ability to foster thoughtful and responsible citizens by prohibiting all student speech and expression about any topic dealing with race. Moreover, we find Plaintiffs-Appellants’ effort to redefine “content” and “viewpoint” to be a red herring. In
R.A. V. v. City of St. Paul,
*573
Furthermore, although the restriction on racially intolerant but not racially tolerant messages may be unconstitutional as applied to adults acting in a public forum,
R.A.V.,
Plaintiff-Appellant Barr stated that it was not until after the “hit list incidents” that the school began enforcing a ban on clothing depicting the Confederate flag, and prior to that time Barr had worn such clothing. J.A. at 243 (Barr Dep. at 16:11— 19). Hord confirmed this understanding of the dress code’s enforcement. J.A. at 110 (Hord Dep. at 13:6-21) (noting that the policy was not really enforced until the “hit lists” appeared on the restroom walls and the “racial graffiti, threats, complaints from parents, [and] a lot of racial tension.”). 8 That the school only began rigorously to enforce the dress code following the “hit lists,” however, does not mean it did so in a viewpoint-discriminatory manner. Lafon attests that he has complied with Hord’s direction “to apply the provisions of the dress code evenly without viewpoint discrimination.” J.A. at 51 (La-fon Aff. at ¶ 4).
The school specifically identified the Confederate flag as subject to enforcement as a violation of the dress code, but also intended the ban to apply to other racially divisive symbols that could reasonably be expected to cause disruption in the school. Hord attests: “In banning racially divisive symbols, I specifically included the Confederate [f]lag because it had been disruptive; however, the Principal of William Blount High School was instructed to ban any racially divisive symbols or flags that caused disruption or was likely to cause disruption.” J.A. at 153 (Hord Aff. 4/3/07 at ¶ 8); see also J.A. at 110 (Hord Dep. at 15:12-18); J.A. at 98 (Lafon Dep. at 9: 11-17). While the school has specifically and explicitly banned the Confederate flag as a result of racial tension in the schools, J.A. at 110 (Hord Dep. at 14: 15-19), the school has not yet done so with respect to other political symbols because of an alleged absence of necessity. In other words, the school alleges that because other symbols have not yet caused a disruption, they have not been explicitly banned. J.A. at 110 (Hord Dep. at 14:24-15:4). Thus, Hord attests that he expects Lafon to enforce a ban on any other flag “[i]f it became disruptive and it proved to be.” J.A. at 110 (Hord Dep. at 15:8) (emphasis added). Hord reiterated at deposition that under the policy, Lafon would enforce a ban against any flag that “became disruptive and offensive to a group to the point *574 [at which] it was disruptive.” J.A. at 122 (Hord Dep. at 62:13-15). Thus, for example, while the school does not currently ban the Canadian flag, “[i]f it became disruptive, if there is someone there that had a deep conceded problem with the Canadian flag and [would] fight you over it, it would become something that we [would] need to deal with.” J.A. at 122 (Hord Dep. at 63:12-15). Plaintiffs-Appellants have produced no evidence suggesting that the school did not have a policy of applying the ban to all disruptive, racially divisive symbols and not just the Confederate flag.
On the one hand, the evidence on the record that the school has explicitly and prospectively banned the Confederate flag but has not done the same with respect to other symbols supports Plaintiffs-Appellants’ argument that the enforcement of the dress code is viewpoint discriminatory. The evidence is uncontested that at the opening assembly of the 2005-2006 school year, Lafon announced only that the dress code’s prohibition applied to the Confederate flag and did not specifically cite any other flags or symbols as similarly prohibited. In
Castorina,
we held that the First Amendment prohibited not only the kind of “formally targeted ban” present in
Tinker
but also “a facially neutral policy that is enforced ... in a content-specific manner.”
Castorina,
Were there evidence that the school
in practice
enforced the dress code against the Confederate flag but not against other racially divisive symbols, we would need to reverse the grant of summary judgment for the school. But Plaintiffs-Appellants have produced no more than “a scintilla of evidence” that the school fails to enforce the dress code against racially divisive symbols other than the Confederate flag.
Anderson,
Plaintiffs-Appellants have not produced evidence disputing Lafon’s testimony that would create a genuine issue of material fact regarding discriminatory enforcement of the dress code. Barr declares in his affidavit that he has seen other students wear clothing depicting Malcolm X and national flags during the 2005-2006 school year. J.A. at 27 (Barr Aff. at ¶ 9). Barr’s declaration in the joint appendix is not signed. Furthermore, Barr stated at deposition that when he saw students, “[o]nee or twice,” wearing clothing like a Malcolm X shirt, he told “teachers” and “it came to a stop.”
9
J.A. at 247 (Barr Dep. at 40:4-14). Barr affirmed that, as far as he knew, the same penalties for wearing Confederate flag clothing applied to wearing the other types of potentially disruptive clothing and he “never saw it enforced any differently.” J.A. at 248 (Barr Dep. at 41:8 — 12).
10
Chris White’s declaration states that “[o]n several occasions during the 2005-2006 school year [she] ha[d] seen other students ... wear clothing that depicted foreign national flags, Malcolm X symbols, and political slogans.” J.A. at 25 (C.W. Decl. at ¶ 9). Chris White testified at deposition, however, that she was not aware of students wearing Malcolm X clothing, and was “not really sure” whether she had seen students wearing national flags on their clothing but thought she had seen “Canadian flags and Mexican flags.” J.A. at 255-56 (Chris White Dep. at 9:20-10:1). Chris White’s declaration in the joint appendix is neither dated nor signed, and thus we cannot consider the declaration to create a factual issue when it contradicts her own deposition testimony.
See Reid v. Sears, Roebuck & Co.,
C. Plaintiffs-Appellants’ Equal Protection Claim
In the circumstances of this case, our analysis of Plaintiffs-Appellants’ Equal Protection claim is essentially the same as our analysis of Plaintiffs-Appellants’ First Amendment claim.
See R.A.V.,
505 U.S. at
*576
384 n. 4,
We reject Plaintiffs-Appellants’ argument that the instant case is analogous to the Supreme Court’s decision in
Police Department of City of Chicago v. Mosley.
In
Mosley,
the Court invalidated a city ordinance that placed geographic and temporal restrictions on picketing outside a school but exempted peaceful labor picketing.
Plaintiffs-Appellants argue that under
Mosley,
the school needs to show that the Confederate flag is “clearly more disruptive” than other flags. Plaintiffs-Appellants Br. at 16 (quoting
Mosley,
D. Plaintiffs-Appellants’ Due Process Claim
The district court did not analyze the Due Process claim explicitly but granted summary judgment to the Board on this claim. Plaintiffs-Appellants did not argue due process (substantive or procedural) in their summary judgment motion, mentioned it once (without analysis) in their opening brief for this court, Plaintiffs-Appellants Br. at 14, and devoted two pages to it in their Reply brief, Reply Br. at 10-11 (arguing that the procedural-due-process elements “align themselves with the requirements of
Mosley,”
which conducts an equal-protection analysis). “[A]n issue is deemed forfeited on appeal if it is merely mentioned and not developed.”
United States v. Clark,
III. CONCLUSION
Because we conclude that the school reasonably forecast that images of the Confederate flag would substantially and materially disrupt the school environment, we AFFIRM the grant of summary judgment to the Board with respect to Plaintiffs-Appellants’ First Amendment claim. Furthermore, because we conclude that the dress code’s ban on racially divisive symbols, as enforced against the Confederate flag, is narrowly tailored to a substantial government interest, we AFFIRM the grant of summary judgment to the Board with respect to Plaintiffs-Appellants’ Equal Protection claim. Lastly, Plaintiffs-Appellants have forfeited their Due Process claim, and we AFFIRM the grant of summary judgment with respect to this claim.
Notes
. Plaintiffs-Appellants brought suit against Lafon in his individual and official capacities. Plaintiffs-Appellants brought suit against Hord only in his official capacity. Defendants-Appellees are collectively referred to as "the Board” throughout the opinion.
. The OCR report states that Student # 2 attended Heritage High School and not William Blount High School. J.A. at 289 (OCR Letter at 1). Both Heritage and William Blount High Schools, however, lie within the Blount County School District and both are subject to the district's policies regarding discrimination and harassment. J.A. at 290 (OCR Letter at 2). OCR did not find material to its investigation the fact that students # 1 and # 2 attended different high schools. Moreover, it is possible that OCR received misinformation from William Blount High School regarding which high school Student # 2 attended. Barr’s testimony at deposition implies that all students involved in the February 22 altercation attended William Blount High School. JA. at 70-71 (Barr. Dep. at 8:4-9:22).
. Lafon was a teacher at the school at this time; he assumed the principalship in the summer of 2005. J.A. at 97 (Lafon Dep. at 6:18-20); J.A. at 120 (Hord Dep. at 53:21-25).
. The declaration is titled "Declaration of C.W.” We assume that the declaration is by Plaintiff-Appellant Chris Nicole White and not Plaintiff-Appellant Roger Craig White because the declaration in one sentence refers to the author of the declaration in the third person, rather than the first person, using the pronoun "she.” J.A. at 25 (Chris White Decl. at ¶ 4). In addition, the caption for the district court opinion in this case referred to Plaintiffs-Appellants as D.B., R.W., and C.W. We therefore deduce that R.W. referred to Roger Craig White and C.W. to Chris Nicole White. J.A. at 45 (5/31/2007 Order).
. "Plainly offensive” speech, proscribable under
Fraser,
"should not be read to encompass any speech that could fit under some definition of 'offensive,' ... [as] much political and religious speech might be perceived as offensive to some.”
Morse,
. Although the record does not make clear whether the fight occurred between a student who was attending William Blount High School and a student who was attending Heritage High School or between two William Blount students, there is no doubt that the fight occurred at William Blount High School. We therefore determine that in the context of other evidence of racial tensions at the school, the fight supports the school’s reasonable forecast that students wearing clothing with the Confederate flag would disrupt the educational process.
. The Eleventh Circuit has upheld school districts’ bans on the display of the Confederate flag under both
Tinker
and
Fraser. Scott v. Sch. Bd. of Alachua County,
The Third Circuit’s decision in
Sypniewski v. Warren Hills Regional Board of Education,
A final Fifth Circuit decision regarding the Confederate flag in public schools similarly does not conflict with our holding but is inapplicable because of its distinct procedural history. In
Augustus v. School Board of Escam-bia County,
. Hord added that sporting events and after-school activities were an exception. J.A. at 116 (Hord Dep. at 38:25-39:5). In those environments, "the flag has not been banned because of the magnitude of being able to ban it.” J.A. at 116 (Hord Dep. at 39:1-5).
. At some point in time (it is not clear from the record), Barr asked students to sign a petition "requesting that the students be allowed to wear Confederate clothing.” J.A. at 244 (Barr Dep. at 22:20-23). It is not clear what happened to the petition, or whether it was presented to any school authority.
. Later in his testimony, however, Barr stated that he "didn’t like [sic] actually see [students] disciplined” for wearing Malcolm X clothing. J.A. at 297 (Barr Dep. at 56:5-6). That Barr did not see the students disciplined, however, does not negate the fact that he was aware of school policy enforcing the dress code against the wearing of clothing celebrating Malcolm X.
