It may seem like common sense to prohibit felons’ possession of bulletproof vests and other forms of body armor, which facilitate violent crime. Indeed, thirty-one states already do so. But the Constitution does not grant the federal government a police power or a general authority to combat violent crime.
See Cohens v. Virginia,
Deciding this question requires us to choose between following an older precedent of the Supreme Court and applying the Court’s current three-part test for determining the reach of the Commerce *619 Clause. We follow the older precedent directly on point, conclude that Congress does have this authority, and AFFIRM the conviction.
I. Factual and Procedural Background
Defendant-Appellant Carl Patton was once a member of the Junior Boys gang in northeast Wichita, Kansas. He has two prior state-court felony convictions for gang-related violence. In 1990 he pleaded guilty to attempted aggravated battery in the shooting of a member of a rival gang, the Crips, and in 1994 he was convicted of aggravated assault, discharge of a firearm at an occupied building, and criminal possession of a firearm, all of which stemmed from an altercation with two members of another competing gang, the Bloods.
In October 2001, after serving his sentence for the second felony, Mr. Patton was paroled to his grandparents’ house in his old neighborhood in Wichita. According to his story, 1 Mr. Patton wanted to be paroled to Connecticut, where his then-girlfriend lived and where he would be far removed from the gang activity with which he had formerly been associated. He was required to return to northeast Wichita, however, because under parole rules he could be paroled only to live with a family member or a spouse. That placed him in continual danger. Even though (according to his story) Mr. Patton had learned his lesson and abandoned his life of gang violence, his former associates and rival gang members still had scores to settle. In late 2001, for example, two members of the Bloods (one armed) approached him at a gas station. Mr. Patton escaped unharmed. In May 2002, members of the Bloods carried out a drive-by shooting on the 2300 block of North Kansas Street in Wichita, firing at Mr. Patton and others who were in the building. Because of the danger to his life, Mr. Patton has refused to allow his children or his grandparents to ride in the same car with him.
In the fall of 2001, after his encounter with the armed gang member at the gas station, Mr. Patton purchased a bulletproof vest that had been manufactured in California. At that time, both his purchase and his possession of the vest were lawful under federal and state law. According to Mr. Patton, during his parole he was not a gang member and wore the vest solely to protect himself.
On November 21, 2003, officers from the Wichita Police Department investigated a domestic disturbance call involving Mr. Patton. When the officers arrived, they found no weapons in Mr. Patton’s possession but did discover that he was wearing a bulletproof vest. On July 29, 2004, Mr. Patton was charged with being a felon in possession of body armor, in violation of a recently enacted statute, 18 U.S.C. § 931. On October 14, 2004, Mr. Patton moved to dismiss the indictment on the grounds that it violated the Commerce and Due Process Clauses of the federal Constitution. The district court denied the motion on November 16. The next day, a superseding indictment added charges that Mr. Patton had possessed the body armor “in and affecting commerce” and that the body armor was a bulletproof vest “that was not produced in the State of Kansas and was sold or offered for sale in interstate or foreign commerce.” R. Vol. I, Doc. 19.
Mr. Patton also raised the defense of necessity. On January 19, 2005, after a hearing, the district court found that Mr. Patton had failed to meet the requirements for a necessity defense. Within a *620 week, Mr. Patton entered a conditional guilty plea, preserving his right to appeal both the denial of his motion to dismiss the indictment and the grant of the government’s motion in limine to exclude a necessity defense. On April 6, 2005, Mr. Patton was sentenced to eighteen months in federal prison and one year of supervised release. He now appeals the issues preserved in the conditional plea.
II. The Commerce Clause
Mr. Patton argues first that he was convicted under a statute that exceeds Congress’s power under the Commerce Clause. We review the constitutionality of the statute
de novo. United States v. Jeronimo-Bautista,
The Supreme Court has articulated “three general categories of regulation in which Congress is authorized to engage under its commerce power.”
Gonzales v. Raich,
A. Channels of Interstate Commerce
First, Congress may regulate the “channels of interstate commerce.”
Lopez,
*621
The statute in this case cannot fit within the first category because it is not directed at the movement of body armor through the channels of interstate commerce. Section 931 prohibits the stationary and entirely intrastate act of possession of body armor. It would be different if the defendant had been convicted under a statute forbidding the interstate transportation of body armor, or perhaps interstate transportation by a felon or for the purpose of sale to a felon. The statute under which he was convicted, however, goes beyond the scope of the first category. A prohibition on the mere intrastate possession of body armor cannot be upheld under Congress’s power to regulate the channels of interstate commerce.
B. Instrumentalities of Interstate Commerce
Under the second category, Congress may regulate and protect “the instrumen-talities of interstate commerce, or persons or things in interstate commerce.”
Lopez,
Regulation under this category may extend to intrastate activities that threaten these instrumentalities. For example, Congress may prevent the intrastate destruction of aircraft.
Perez,
The statute in this case does not fall within the second category. Body armor itself is not an instrumentality, or means, of interstate commerce, and the statute does not protect body armor while it is moving in interstate shipment. Nor is the statute directed at the use of body armor in ways that threaten or injure the instrumentalities of interstate commerce. The statute prohibits the bare possession of body armor by a felon, wherever it occurs, and without regard to its use or effect. Accordingly, it exceeds congressional authority to protect the instrumentalities of, and persons or things in, interstate commerce.
C. Activities Substantially Affecting Interstate Commerce
Under the third category, Congress may regulate “activities that substantially affect interstate commerce.”
Lopez,
Consideration of effects necessarily involves matters of degree. The third category thus poses not two hazards, like Scylla and Charybdis, but three. If we entertain too expansive an understanding of effects, the Constitution’s enumeration of powers becomes meaningless and federal power becomes effectively limitless. If *623 we entertain too narrow an understanding, Congress is stripped of its enumerated power, reinforced by the Necessary and Proper Clause, to protect and control commerce among the several states. If we employ too nebulous a standard, we exacerbate the risk that judges will substitute their own subjective or political calculus for that of the elected representatives of the people, or will appear to be doing so.
The Supreme Court’s decisions in
Lopez, United States v. Morrison,
1. Is the regulated activity commercial?
We first consider “whether the prohibited activity is commercial or economic.”
Jeronimo-Bautista,
In
Lopez,
the Court held that possession of firearms, in itself, is not commercial or economic.
We recognize that in
Raich,
the Court interpreted the contours of the third category by reference to “economics” rather than “commerce,” and included the “consumption of commodities” as well as their production and distribution within that definition.
Id.
(internal quotation marks omitted). That does not alter our conclusion. First, we are bound by the holding of
Lopez,
reaffirmed in
Raich,
that the mere possession of firearms near a school is not a commercial activity for purposes of the third category. Second, possession of firearms or body armor cannot be described as “consumption.” Consumption is the “act of destroying a thing by using it; the use of a thing in a way that thereby exhausts it,”
Black’s Law Dictionary
336 (8th ed.2004), and possessing or wearing body armor neither destroys nor exhausts it. Finally, we note that the
Raich
opinion as a whole treats congressional authority over the domestic consumption of marijuana as within the third category only because it was connected to a comprehensive national ban on “the production, distribution, and consumption of commodities for which there is an established, and lucrative, interstate market.”
Raich,
Our conclusion that the possession of body armor is not a commercial activity does not end the inquiry, but it does channel our analysis. Where the regulated activity is commercial in nature, it generally (perhaps invariably) follows that, aggregated with similar activities elsewhere, the activity affects the national economy sufficiently to fall within congressional power.
See, e.g., United States v. Sullivan,
*626 2. What is the relation of the regulated activity to interstate commerce?
Where possession of an
item is
not a commercial activity in itself, it may nonetheless have a substantial and non-attenuated effect on interstate commerce in two ways. First, possession of a good is related to the market for that good, and Congress may regulate possession as a necessary and proper means of controlling its supply or demand. For example, the federal government may elect to prohibit the possession of eagle feathers as a practical means of drying up the market for them, and thus protecting against the killing of eagles.
Andrus v. Allard,
a. Regulation of possession as a means of regulating the interstate market for body armor
In
Raich,
In the statute at issue in
Wickard,
Congress enacted a comprehensive program limiting the production of certain agricultural commodities for the purpose of raising their market price.
In both
Raich
and
Wickard,
the regulation of domestic possession and use was justified on the basis of its impact on a comprehensive regulatory scheme directed at interstate production, distribution, and sale. By contrast, in
Lopez,
where there was no such connection to a comprehensive regulation of the national market, the Court made clear that Congress could not reach mere possession under the Commerce Clause.
This Court has used the same rationale to sustain congressional prohibitions on the production and possession of child pornography. In
Jeronimo-Bautista
and
Grimmett,
this Court held that Congress has authority under the Commerce Clause to prohibit mere possession of child pornography, on the rationale that prohibiting possession was an essential part of a comprehensive scheme to destroy the market for this pernicious commodity.
Grimmett,
Where the statute is not part of a comprehensive scheme of regulation, however, the Court has not upheld federal regulation of purely intrastate noneconomic activity.
See Morrison,
We must therefore determine whether the prohibition on possession of body armor by felons is an essential part of “comprehensive legislation to regulate the interstate market in a fungible commodity.”
Raich,
Moreover, in this case, Mr. Patton acquired his bulletproof vest at a time when possession of body armor by felons was lawful. Here, therefore, there is no logical connection- — not even an attenuated one— between his possession and the body armor market. Since it was lawful for him to purchase and possess the armor when he bought it, prohibition of continued possession cannot contribute, even indirectly, to regulating the market.
Cf. United
*628
States v. Marrero,
Nor does it matter that body armor is subject to pervasive regulation by the states, as discussed below. Such regulation of a commodity is not enough to establish a comprehensive regulatory scheme, because this was surely present in Lopez and the states and the federal government regulate firearms more extensively than body armor. See Anthony A. Braga et al., The Illegal Supply of Firearms, 29 Crime & Just. 319, 321-24 (2002) (describing the extensive regulation of firearms). Like the statute in Lopez, section 931 regulates possession for its own sake and cannot be justified as part (much less as an essential part) of a comprehensive regulation of the market in body armor.
b. Regulation of possession as a means of controlling uses that might affect interstate commerce
The second way in which noncommercial, intrastate possession of an item might substantially affect interstate commerce is related to use. Possession might be prohibited as an anticipatory means of prohibiting use of a thing in a way that affects interstate commerce.
Actually, any use of anything might have an effect on interstate commerce, in the same sense in which a butterfly flapping its wings in China might bring about a change of weather in New York. Thomas Jefferson warned against an overly expansive notion of cause and effect in interpreting the combination of Congress’s enumerated powers and the Necessary and Proper Clause:
Congress are authorized to defend the nation. Ships are necessary for defense; copper is necessary for ships; mines necessary for copper; a company necessary to work mines; and who can doubt this reasoning who has ever played at “This is the House that Jack Built?”
Letter from Thomas Jefferson to Edward Livingston (Apr. 30,1800),
in
10
The Writings of Thomas Jefferson
165 (Albert Ellery Bergh ed., 1903).
See also United States v. A.L.A. Schechter Poultry Corp.,
That is why the Supreme Court has insisted that, to justify congressional exertion of the commerce power within the third category, the effects must be both “significant” and not “attenuated.”
See, e.g., Morrison,
No one would question that the possession of body armor by felons contributes to crime, or that crime has a measurable and significant impact on the national economy. But that was the argument rejected in Lopez and Morrison. Possession of firearms in the vicinity of schools can contribute to crime, and gender-motivated violence is crime. This Court, being bound by the precedents of Lopez and Morrison, therefore cannot hold that simply because body armor facilitates crime, the subject falls within Congress’s commerce power.
Indeed, application of section 931 in this case has an even more attenuated relation to interstate commerce than the possession of firearms in Lopez — let alone the actual commission of violent offenses in Morrison. Unlike carrying a firearm in the vicinity of a school, wearing body armor is not an inherently threatening act. Much of the time, wearing body armor is an act of self-defense, which reduces rather than increases crime. This case illustrates the point: Mr. Patton was not armed at the time he was apprehended and — according to his story — was wearing the vest solely because his prior gang activity, now abandoned, made him vulnerable to attack. If the statute were limited to possession of body armor in conjunction with an offensive weapon, or to the use of body armor in the commission of a crime affecting interstate commerce, which were the scenarios motivating its enactment, 6 the connection would be less attenuated. As it is, however, application of section 931 to the circumstances of this case cannot be reconciled with Lopez and Morrison.
Moreover, the dissenters’ arguments in
Lopez
and
Morrison
regarding the substantial effect of the regulated conduct on interstate commerce largely rested on the frequent incidence, and therefore significant aggregated effect, of the conduct.
See e.g., Lopez,
3. What are the congressional findings?
Analysis of the effect of felons’ possession of body armor is facilitated by Congress’s “specific findings regarding the effects of the prohibited activity on interstate commerce.”
Grimmett,
Although there were no preambulatory findings enacted as part of the statute, the House Report contained the following formal findings regarding the rationale for section 931:
(1) nationally, police officers and ordinary citizens are facing increased danger as criminals use more deadly weaponry, body armor, and other sophisticated assault gear;
(2) crime at the local level is exacerbated by the interstate movement of body armor and other assault gear;
(3) there is a traffic in body armor moving in or otherwise affecting interstate commerce, and existing Federal controls over such traffic do not adequately enable the States to control this traffic within their own borders through the exercise of their police power;
(4) recent incidents, such as the murder of San Francisco Police Officer James Guelff by an assailant wearing 2 layers of body armor, a 1997 bank shoot out in north Hollywood, California, between police and 2 heavily armed suspects outfitted in body armor, and the 1997 murder of Captain Chris McCurley of the Etowah County, Alabama Drug Task Force by a drug dealer shielded by protective body armor, demonstrate the serious threat to community safety posed by criminals who wear body armor during the commission of a violent crime....
H.R. Rep. 107-193, pt. 1, at 2.
Several of these findings make no mention of interstate commerce. Those that do focus on three points: (1) an interstate market for body armor exists, (2) the interstate movement of body armor increases crime, and (3) federal controls over the interstate market will allow states to control the intrastate trade in body armor. The first two points are surely true, but they were also true in
Lopez.
An interstate market exists for guns and for body armor, and the interstate movement of both can increase crime. Yet in
Lopez
the existence of the market and the incidence of crime did not establish that the prohibited possessions substantially affected interstate commerce.
See Lopez,
The congressional findings regarding the existence of an interstate market for body armor would be more meaningful if the statute attempted to suppress or limit that market. As discussed above, however, it does not. Manufacture, distribution, and sale of body armor — even sale of body armor to felons — is entirely lawful, and has not been regulated by Congress. Congressional findings that “crime at the local *631 level is exacerbated by the interstate movement of body armor and other assault gear” and that “there is a traffic in body armor moving in or otherwise affecting interstate commerce,” H.R.Rep. No. 107-193, pt. 1, at 2, while undoubtedly true, do nothing to explain or justify a statute that does not limit the interstate movement of body armor or the traffic in it.
The third point suggests that federal regulation of the interstate traffic in body armor would somehow enable the states themselves to prohibit felons’ possession. But thirty-one states already regulate the possession or use of body armor, with an array of legislative approaches.
7
It is thus clear that the federal prohibition does not “enable” state prohibitions. At best, the federal law duplicates the state prohibitions. At worst, it may conflict with a state’s policy judgment,
see Jones v. United States,
Moreover, the findings indicate that this statute falls primarily within an area of traditional regulation by the states, namely protecting “police officers and ordinary citizens” from violent crime.
See Lopez,
4. Is there a sufficient jurisdictional hook?
Finally, we consider “whether the statute’s reach was limited by an express jurisdictional element.”
Jeronimo-Bautista,
The principal practical consequence of a jurisdictional hook is to make a facial constitutional challenge unlikely or impossible, and to direct litigation toward the statutory question of whether, in the particular case, the regulated conduct possesses the requisite connection to interstate commerce.
See Jones,
The statute under which Mr. Patton was charged also has a jurisdictional hook, but it does not seriously limit the reach of the statute. The jurisdictional hook, § 921(a)(35), limits the definition of “body armor” to “any product sold or offered for sale, in interstate or foreign commerce, as personal protective body covering intended to protect against gunfire.” Nearly all body armor will meet that test. More important, there is no reason to think that possession of body armor that satisfies the jurisdictional hook has any greater effect on interstate commerce than possession of any other body armor.
If Congress intended to suppress the interstate market in body armor, then directing a prohibition on possession towards armor that had moved in interstate commerce would make sense.
Cf. Wickard,
A jurisdictional hook that restricts a statute to items that bear a “trace of interstate commerce” is no restriction at all.
Jones,
Given that Mr. Patton’s possession was not interstate, not commercial, and not an *634 essential part of a comprehensive scheme of economic regulation, that his use of the bulletproof vest was in self-defense and not connected to crimes that might affect interstate commerce, and in light of the CBO’s prediction that the statute would be applied fewer than ten times a year, we find no rational basis for concluding that the possession of body armor prohibited by section 931 substantially affects interstate commerce. We thus conclude that 18 U.S.C. § 931 cannot be justified as a regulation of the channels of commerce, as a protection of the instrumentalities of commerce, or as a regulation of intrastate activity that substantially affects interstate commerce.
D. Scarborough v. United States
Although the body armor statute does not fit within any of the
Lopez
categories, it is supported by the
pre-Lopez
precedent of
Scarborough v. United States,
The constitutional understanding implicit in
Scarborough
— that Congress may regulate any firearm that has ever traversed state lines — has been repeatedly adopted for felon-in-possession statutes by this Court. In
United States v. Bolton,
Other circuits have similarly continued to follow
Scarborough,
though some have expressed doubts about its continuing validity.
See, e.g., United States v. Weems,
The two courts outside this Circuit that have considered the constitutionality of 18 U.S.C. § 931 have taken a similar approach. One found the question controlled by
Scarborough
and Third Circuit precedents upholding 18 U.S.C. § 922(g).
See United States v. Kitsch,
Because Mr. Patton’s bulletproof vest moved across state lines at some point in its existence, Congress may regulate it under Scarborough, even though it does not fall within any of the three categories the Court now recognizes for Commerce Clause authority. The prohibition on possessing body armor cannot be distinguished from the prohibitions on possessing firearms that we have upheld. As noted above, firearms are more broadly regulated than body armor. But in Bolton, Farnsworth, and Dorris this Court never treated the constitutionality of the firearm statutes as turning on the scope of the regulatory scheme. Consequently, this difference between body armor and *636 firearms is not relevant under the Scarborough line of analysis. Following our precedent, we conclude that 18 U.S.C. § 931 does not exceed congressional power under the Commerce Clause.
Like our sister circuits, we see considerable tension between
Scarborough
and the three-category approach adopted by the Supreme Court in its recent Commerce Clause cases, and like our sister circuits, we conclude that we are bound by
Scarborough,
which was left intact by
Lopez.
Even if we were not persuaded that
Scarborough
remains “the case which directly controls,”
Agostini v. Felton,
III. Due Process
Mr. Patton’s remaining constitutional arguments may be disposed of quickly. He makes two as-applied challenges to the statute under the Due Process Clause of the Fifth Amendment. The first is that the statute deprived him of property he had legitimately acquired, namely the bulletproof vest, without due process of law.
As the government points out, Mr. Patton cites no authority in support of his argument. But his claim is reminiscent of that in
Dred Scott v. Sandford,
Mr. Patton’s second due process argument is that he has a right of self-protection. With no assurance of government safekeeping, Mr. Patton had to protect himself “from his enemies on the street.” Br. for Appellant 15. The federal government prevented him from doing so, he claims, by taking away his one legal means of self-protection, the bulletproof vest.
The Due Process Clause of the Fifth Amendment does not give Mr. Patton the right to protect himself through unlawful means. As Mr. Patton concedes, the government does not have a constitutional obligation to protect a person’s life, liberty, and property from harm inflicted by third parties.
DeShaney v. Winnebago County Dep’t of Soc. Servs.,
IV. The Necessity Defense
Mr. Patton also challenges the district court’s exclusion of his “modified justification defense.” Br. for Appellant 18. Although Mr. Patton declines to confine his defense to conventional legal categories such as necessity or duress, in substance this is a necessity defense, and we review the district court’s denial of a necessity defense for abuse of discretion.
See United States v. Seward,
Mr. Patton’s argument assumes that a federal common law defense of necessity exists, and the government does not contend otherwise. Even though the Supreme Court has called it “an open question whether federal courts ever have authority to recognize a necessity defense not provided by statute,”
United States v. Oakland Cannabis Buyers’ Coop.,
The district court granted the government’s motion in limine to exclude Mr. Patton’s “modified justification defense,” finding as a matter of law that Mr. Patton had not asserted facts sufficient to support it. In effect, Mr. Patton is asking for a necessity defense without the usual imminence requirement. He proposes this less rigorous variant of the necessity defense primarily on the grounds that his crime threatened no one. He also argues that in his case the “risk of harm [was] more omnipresent than imminent.” Br. for Appellant 21.
Mr. Patton, then, is asking us to restructure the requirements of the necessity defense for purportedly “victimless” crimes. Others have made the same suggestion.
See, e.g.,
Model Penal Code § 3.02(l)(a) (offering a “choice of evils” defense that does not require imminence but does require that “the harm or evil sought to be avoided by such conduct is greater than that sought to be prevented by the law defining the offense charged”); Lawrence P. Tiffany & Carl A. Anderson,
Legislating the Necessity Defense in Criminal Law, 52
Denv. L.J. 839, 854 (1975) (“No matter how improbable or temporally remote the threatened harm, should not the scales be tipped in favor of a defendant who sought to avoid that threatened harm by an act that posed no threat to anyone?”);
Aldrich v. Wright,
Mr. Patton must therefore meet the traditional common law requirements of the necessity defense: “(1) there is no legal alternative to violating the law, (2) the harm to be prevented is imminent, and (3) a direct, causal relationship is reasonably anticipated to exist between the defendant’s action and the avoidance of harm.”
Meraz-Valeta,
V. Conclusion
Because we reject Mr. Patton’s constitutional claims and uphold the district court’s exclusion of the necessity defense, we AFFIRM the conviction.
Notes
. For purposes of adjudicating the issues in this case, the district court accepted and the government does not contest Mr. Patton's account of the factual background.
. We surmise that Mr. Patton is bringing both a facial challenge to the statute to the extent it forbids possession and an as-applied challenge to a ban on Mr. Patton's ''[s]imple possession of a bullet-proof vest that has come to rest in Kansas, and which has long since left the channels of commerce.” Br. for Appellant 13. Mr. Patton does not challenge the statute as it applies to purchases.
.
Caminetti
is no exception. Although the statute upheld in that case does focus on the purpose of the transportation — prostitution— this must be the purpose at the time of transportation; the statute does not criminalize the transportation of persons who happen, after crossing state lines, to become prostitutes.
See Caminetti,
. Although in
Wiltcs
we did describe machine guns as "things in interstate commerce,” we effectively analyzed the statute using the tools of the third category, such as considering the national market, aggregating the effects on interstate commerce, and considering the broader regulatory scheme.
Wilks,
. Justice Thomas has espoused a narrower historical definition, confining the term to its primary sense of buying and selling goods and excluding preparatory activities.
See Lopez,
. Congress enacted the statute in response to three notorious incidents in which armed criminals wore body armor — a bank shootout in North Hollywood, California, the shooting of a San Francisco police officer after a long gun battle, and the shooting of an Alabama police officer by a drug dealer resisting a search warrant. H.R.Rep. No. 107-193, pt. 1, at 4 (2001).
. In fifteen states a person commits a crime or receives a higher sentence for wearing body armor while committing certain crimes (Arizona, Delaware, Georgia, Indiana, Massachusetts, Minnesota, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, West Virginia); in four states, for wearing body armor and possessing a deadly weapon while committing certain crimes (Florida, Kentucky, Utah, Virginia); in five states, for possessing body armor after being convicted of a felony (Alabama, Arizona, Connecticut, Texas, Wisconsin); in six states, for wearing body armor while committing certain crimes or for possessing body armor after being convicted of a felony (California, Illinois, Louisiana, Maryland, Michigan, South Carolina); and in one state, for wearing body armor and possessing a deadly weapon while committing certain crimes or for possessing body armor after being convicted of a felony (Oregon). Additionally, one state that restricts felon possession also requires that sales to private parties be made face-to-face (Connecticut).
. We do not mean to suggest that subjects of traditional state concern are immune from congressional regulation when they fall within Congress’s Article I powers. Our constitutional federalism is based on a one-way enumeration: the question is whether a particular authority has been vested in Congress, not whether it falls within the reserved powers of the states, which are defined only negatively. But evidence regarding traditional divisions of power between the states and the federal government can help to show how the Constitution’s enumerations have been interpreted over time.
