Plaintiff-Appellant Chris Hynes, an inmate at Shawangunk Correctional Facility, filed suit alleging that a corrections officer violated Hynes’ First Amendment rights by charging him with misbehavior in retaliation for his prior inmate complaints, and that the prison hearing officer who ruled on the misbehavior report violated Hynes’ due process rights under the Fourteenth Amendment. After referring the case to a Magistrate Judge and receiving the Magistrate Judge’s Report-Recommendation, the United States District Court for the Northern District of New York (Scullin, J.) granted defendants’ motion for summary judgment, denied plaintiffs motion for summary judgment, and dismissed the complaint.
Hynes appeals on the grounds that in granting summary judgment on the retaliation claim the district court erroneously relied on evidence submitted to the district court for the first time with the defendants’ objections to the Report-Recommendation of the Magistrate Judge, that in any event questions of fact remain on the retaliation claim, and that the district court made insufficient findings to support its ruling (under
Sandin v. Conner,
BACKGROUND
Hynes alleges that on November 5 and November 9, 1994, he filed grievances with defendant Louis Mann, Shawangunk’s super *655 intendent, complaining about abusive conduct by defendant N. Buth, a correctional officer. He claims that on the evening of November 25, 1994, he asked Buth whether he had called the package room to check on the availability of a package that Hynes’ family had dropped off earlier that day. According to Hynes, Buth responded, “No, handle it, write another complaint.” The specific details of what followed are disputed; but it is uncontested that Hynes disobeyed Buth’s direct order to lock into his cell.
The next day, Hynes was served with a misbehavior report, filed by Buth, charging him with violations of: (i) Rule 102.10, which provides that “[ijnmates shall not, under any circumstances, make any threat, spoken, in writing, or by gesture”; (ii)’ Rule 106.10, which provides that “[a]ll orders of facility personnel will be obeyed promptly and without argument”; (iii) Rule 107.11, which provides that “[ijnmates shall not verbally or in writing harass employees. This includes using insolent, abusive and/or obscene language and gestures”; and (iv) Rule' 104.18, which provides that “[ijnmates shall not engage in conduct which disturbs the order of any part of the facility. This includes, but is not limited to, loud talking in, mess halls, program areas or corridors.”
Hynes spent 21 days in keeplock confinement pending the completion of his Tier III disciplinary hearing. 1 On December 15, 1994, he was found guilty of all of the charged rule violations and sentenced to 180 days in SHU. On January 27, 1995, Mann reversed the 180-day sentence after discovering that part of the tape recording of the disciplinary hearing was inaudible.
Hynes sued Mann, Buth, and J. Squillace, the hearing officer, pursuant to 42 U.S.C. § 1983, claiming: (i) that Buth filed the misbehavior report in retaliation for Hynes’ complaints to Mann, in violation of the First Amendment; and (ii) that Hynes was denied due process, both prior to and at his disciplinary hearing, in violation of the Fourteenth Amendment.
2
The parties both moved for summary judgment. Magistrate Judge Scanlon recommended dismissal of Hynes’ Fourteenth Amendment claim, finding that Hynes had not been deprived of a liberty interest under
Sandin v. Conner,
Defendants then filed an objection to the Magistrate Judge’s Report-Recommenda-. tion, claiming that they were entitled to summary judgment on the retaliation claim because the evidence demonstrated Hynes’ guilt of the violations charged in the misbehavior report. In support of their objection, defendants submitted supplemental evidence, including a partial transcript of the Tier III disciplinary hearing.
Hynes also filed an objection to the Report-Recommendation, claiming that: (i) he was entitled to summary judgment on the retaliation claim, and (ii) the Magistrate Judge erred in the Sandin analysis. Hynes also submitted a separate letter objecting to the defendants’ submission of supplemental evidence in support of their motion for summary judgment on the retaliation claim.
The district court granted defendants’ motion for summary judgment on all claims. On appeal, Hynes claims that the district court erred: (i) in dismissing his retaliation claim, both because the supplemental evidence should not have been considered, and because even considering this evidence, disputed issues of fact remain; and (ii) in failing to explain adequately the factual findings underlying its conclusion that plaintiff had *656 not been deprived of a liberty interest under Sandin.
DISCUSSION
I
Reliance on Supplemental Evidence.
Considerations of efficiency and fairness militate in favor of a full evidentiary submission for the Magistrate Judge’s consideration, and we have upheld the exercise of the district court’s discretion in refusing to allow supplementation of the record upon the district court’s
de novo
review.
See, e.g., Paddington Partners v. Bouchard,
At the same time, the district court had discretion to consider evidence that had not been submitted to the Magistrate Judge. Under 28 U.S.C. .§ 636(b)(1), the Magistrate Judge’s Report-Recommendation was subject to de novo review as to those issues upon which the parties raised • objections. Both § 636(b)(1) and Fed.R.Civ.P. 72(b) explicitly permit the district court to receive additional evidence as part of its review. See 28 U.S.C. § 636(b)(1) (1994) (“[T]he [district] judge may also receive further evidence____”); Fed.R.Civ.P. 72(b) (“The district judge to whom the ease is assigned shall make a de novo determination upon the record, or after additional evidence, of any portion of the magistrate judge’s disposition to which specific written objection has been made----”); see also 12 Charles Alan Wright, Arthur R. Miller & Richard L. Marcus, Federal Practice and Procedure § 3070.2, at 378 (1997) (“The statute and the rule both confirm, further, that the district judge is completely free to supplement the record developed by the magistrate judge with further evidence ....”).
We do not think that the district court here abused its discretion in considering the defendants’ supplemental evidence. The defendants plausibly asserted that they originally construed all of plaintiffs causes of action to be governed by Sandin, and therefore did not address the separate merits of the retaliation claim before the Magistrate Judge. The district court had discretion to accept this explanation, and it did.
Notwithstanding the district court’s discretion to consider this supplemental evidence, the parties agree that the court erred in failing to give Hynes notice of its intention to consider this supplemental evidence in resolving the objections to the Magistrate Judge’s Report-Recommendation. However, Hynes was not prejudiced by the district court’s failure to give such notice. Hynes had moved for summary judgment on the retaliation claim before the Magistrate Judge; he therefore had every incentive to submit all evidence supporting his retaliation claim. After the Magistrate Judge recommended denial of the motions for summary judgment on the retaliation claim, Hynes objected, claiming that the Magistrate Judge should have recommended granting his motion. At that time, he also had the right to submit a response to defendants’ objections to the Report-Recommendation, and chose to limit his response to technical objections relating to the supplementation of the record.
See
Fed.R.Civ.P. 72(b) (“A party may respond to another party’s objections within 10 days after being served with a copy thereof.”). Thus, Hynes had opportunities and incentives to submit evidence supporting his retaliation claim. Finally, Hynes has not pointed to any other evidence that he might have offered to counter defendants’ supple
*657
mental evidence. Accordingly, we cannot find that the district court’s failure to give Hynes notice of its intention to rely on the supplemental evidence prejudiced Hynes, and any procedural error was harmless.
Cf. Coach Leatherware Co. v. AnnTaylor, Inc.,
Issues of Fact.
Hynes argues next that even if the district court properly considered defendants’ supplemental evidence, disputed issues of fact remained that precluded summary judgment on the retaliation claim. In order to sustain a retaliation claim, the plaintiff must demonstrate that he engaged in constitutionally protected conduct and that the “protected conduct was a substantial or motivating factor in the prison officials’ decision to discipline the plaintiff.”
Graham v. Henderson,
We have established a “presumption that a prison official’s acts to maintain order are done for a proper purpose.”
Rivera v. Senkowski,
Here, the most serious charge in the misbehavior report was that Hynes refused to obey a direct order. Arguably as serious is the making of a threat (although here the force of any threat would have been abated if Hynes had complied with the order to allow himself to be locked in his cell). As to the refusal to obey a direct order, Hynes conceded that charge at his disciplinary hearing (and in his brief). See Appellant’s Brief at 18; Appendix at 188. Later in the hearing, Hynes also admitted that he was loud and boisterous and had made some threats: “You know, I admit, you know, I was loud and boisterous, running around with my fist clenched and making threats and all that stuff like it says in the report, but I was upset about the thing with the package — ” These admissions were corroborated by Buth’s and Sergeant Kobelt’s testimony at the hearing, and by the hearing officer’s decision, which found Hynes guilty on all charges and which was reversed only because, of a recording error. This evidence demonstrates that Hynes in fact committed the most serious, if not all, of the prohibited conduct charged in the misbehavior report, and thus the defendants met their burden of demonstrating proper, non-retaliatory reasons for filing the misbehavior report. Accordingly, the district court properly granted summary judgment to defendants on the retaliation claim.
II
Hynes claims that the district court (i) did not sufficiently articulate the factual predicates for its finding that Hynes’ 21-day pre-hearing keeploek confinement did not deprive him of a liberty interest under
Sandin v. Conner,
To state a Section 1983 claim, a plaintiff must demonstrate that he possessed a protected liberty or property interest, and that he was deprived of that interest without due process.
See Green v. Bauvi,
Citing
Brooks v. DiFasi,
Miller, Brooks
and
Wright
all involved relatively long periods of SHU confinement, and specific articulation of the factual findings underlying the district court’s liberty interest analysis was necessary. However, in eases involving shorter periods of segregated confinement where the plaintiff has not alleged any unusual conditions, the district court need not provide such detailed explanation of its reasoning. For example, in
Arce v. Walker,
Here, Hynes offered no evidence in support of his argument that his 21-day keep-lock confinement was atypical or significant, notwithstanding his familiarity with the conditions of his own confinement, while the defendants submitted detailed evidence on the typicality of Hynes’ confinement. Noting that “[p]laintiff has not presented any evidence demonstrating that his pre-hearing confinement in keeplock for twenty-one (21) days extended his sentence in an unexpected manner, or was atypical in any way,” the district court concluded that Hynes had not been deprived of a liberty interest. Moreover, the district court adopted the Magistrate Judge’s Report-Recommendation, which contained a finding that the conditions of Hynes’ keeplock confinement mirrored the conditions of other segregated inmates. Given plaintiffs failure of proof, including his failure to allege any unusual conditions, the short span of the confinement at issue, and previous decisions (including Sandin) holding that comparable periods and conditions of segregation do not amount to a deprivation of a liberty interest, we think the district court sufficiently articulated the factual predicates *659 underlying its liberty interest analysis. 3
Finally, Hynes claims that the district court failed to afford him an opportunity to conduct discovery on the typicality of his keeplock confinement. However, Hynes did not request discovery relating to the Sandin inquiry and failed even to submit an affidavit setting forth his personal knowledge regarding the atypicality of his 21-day keeplock confinement. The district court correctly granted summary judgment to defendants on the Fourteenth Amendment due process claim.
CONCLUSION
The judgment of the district court is affirmed.
Notes
. New York conducts three types of disciplinary hearings for its inmates. Tier I hearings address the least serious infractions and have as their maximum punishment loss of privileges such as recreation. Tier II hearings address more serious infractions and may result in 30 days of confinement in a Special Housing Unit ("SHU”). Tier III hearings concern the most serious violations and may result in unlimited SHU confinement (up to the length of the sentence) and recommended loss of "good time” credits.
. In his objections to the Magistrate Judge’s Report-Recommendation, and on appeal, Hynes as- ■ serts deprivation of a liberty interest only with regard to his 21-day pre-hearing keeplock confinement.
. Hynes does not specifically challenge the merits of the district court's conclusion that he was not deprived of a liberty interest under Sandin.
