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The New York City law, which required that gunpowder in the home be stored in certain sorts of containers, and laws in certain Pennsylvania towns, which required that gunpowder be stored on the highest story of the home, could well have presented similar obstacles to in-home use of firearms. See Act of April 13, 1784, ch. 28, 1784 N. Y. Laws p. 627; An Act for Erecting the Town of Carlisle, in the County of Cumberland, into a Borough, ch. XIV, §XLII, 1782 Pa. Laws p. 49; An Act for Erecting the Town of Reading, in the County of Berks, into a Borough, ch. LXXVI, §XLII, 1783 Pa. Laws p. 211. Although it is un-clear whether these laws, like the Boston law, would have prohibited the storage of gunpowder inside a firearm, they would at the very least have made it difficult to reload the gun to fire a second shot unless the homeowner happened to be in the portion of the house where the extra gunpowder was required to be kept. See 7 United States Encyclopedia of History 1297 (P. Oehser ed. 1967) ("Until 1835 all small arms [were] single-shot weapons, requiring reloading by hand after every shot"). And Pennsylvania, like Massachusetts, had at the time one of the self-defense-guaranteeing state constitutional provisions on which the majority relies. See ante, at 28 (citing Pa. Declaration of Rights, Art. XIII (1776), in 5 Thorpe 3083).

The majority criticizes my citation of these colonial laws. See ante, at 59-62. But, as much as it tries, it cannot ignore their existence. I suppose it is possible that, as the majority suggests, see ante, at 59-61, they all in practice contained self-defense exceptions. But none of them expressly provided one, and the majority's assumption that such exceptions existed relies largely on the preambles to these acts-an interpretive methodology that it elsewhere roundly derides. Compare ibid. (interpreting 18th-century statutes in light of their preambles), with ante, at 4-5, and n. 3 (contending that the operative language of an 18th-century enactment may extend beyond its preamble). And in any event, as I have shown, the gunpowder-storage laws would have burdened armed self-defense, even if they did not completely prohibit it.

This historical evidence demonstrates that a self-defense assumption is the beginning, rather than the end, of any constitutional inquiry. That the District law impacts self-defense merely raises questions about the law's constitutionality. But to answer the questions that are raised (that is, to see whether the statute is unconstitutional) requires us to focus on practicalities, the statute's rationale, the problems that called it into being, its relation to those objectives-in a word, the details. There are no purely logical or conceptual answers to such questions. All of which to say that to raise a self-defense question is not to answer it.

III

I therefore begin by asking a process-based question: How is a court to determine whether a particular firearm regulation (here, the District's restriction on handguns) is consistent with the Second Amendment? What kind of constitutional standard should the court use? How high a protective hurdle does the Amendment erect?

The question matters. The majority is wrong when it says that the District's law is unconstitutional "[u]nder any of the standards of scrutiny that we have applied to enumerated constitutional rights." Ante, at 56. How could that be? It certainly would not be unconstitutional under, for example, a "rational basis" standard, which requires a court to uphold regulation so long as it bears a "rational relationship" to a "legitimate governmental purpose." Heller v. Doe, 509 U. S. 312, 320 (1993). The law at issue here, which in part seeks to prevent gun-related accidents, at least bears a "rational relationship" to that "legitimate" life-saving objective. And nothing in the three 19th-century state cases to which the majority turns for support mandates the conclusion that the present District law must fall. See Andrews v. State, 50 Tenn. 165, 177, 186- 187, 192 (1871) (striking down, as violating a state constitutional provision adopted in 1870, a statewide ban on a carrying a broad class of weapons, insofar as it applied to revolvers); Nunn v. State, 1 Ga. 243, 246, 250-251 (1846) (striking down similarly broad ban on openly carrying weapons, based on erroneous view that the Federal Second Amendment applied to the States); State v. Reid, 1 Ala. 612, 614-615, 622 (1840) (upholding a concealed-weapon ban against a state constitutional challenge). These cases were decided well (80, 55, and 49 years, respectively) after the framing; they neither claim nor provide any special insight into the intent of the Framers; they involve laws much less narrowly tailored that the one before us; and state cases in any event are not determinative of federal constitutional questions, see, e.g., Garcia v. San Antonio Metropolitan Transit Authority, 469 U. S. 528, 549 (1985) (citing Martin v. Hunter's Lessee, 1 Wheat. 304 (1816)).

Respondent proposes that the Court adopt a "strict scrutiny" test, which would require reviewing with care each gun law to determine whether it is "narrowly tailored to achieve a compelling governmental interest." Abrams v. Johnson, 521 U. S. 74, 82 (1997); see Brief for Respondent 54-62. But the majority implicitly, and appropriately, rejects that suggestion by broadly approving a set of laws-prohibitions on concealed weapons, forfeiture by criminals of the Second Amendment right, prohibitions on firearms in certain locales, and governmental regulation of commercial firearm sales-whose constitutionality under a strict scrutiny standard would be far from clear. See ante, at 54.

Indeed, adoption of a true strict-scrutiny standard for evaluating gun regulations would be impossible. That is because almost every gun-control regulation will seek to advance (as the one here does) a "primary concern of every government-a concern for the safety and indeed the lives of its citizens." United States v. Salerno, 481 U. S. 739, 755 (1987). The Court has deemed that interest, as well as "the Government's general interest in preventing crime," to be "compelling," see id., at 750, 754, and the Court has in a wide variety of constitutional contexts found such public-safety concerns sufficiently forceful to justify restrictions on individual liberties, see e.g., Brandenburg v. Ohio, 395 U. S. 444, 447 (1969) (per curiam) (First Amendment free speech rights); Sherbert v. Verner, 374 U. S. 398, 403 (1963) (First Amendment religious rights); Brigham City v. Stuart, 547 U. S. 398, 403-404 (2006) (Fourth Amendment protection of the home); New York v. Quarles, 467 U. S. 649, 655 (1984) (Fifth Amendment rights under Miranda v. Arizona, 384 U. S. 436 (1966)); Salerno, supra, at 755 (Eighth Amendment bail rights). Thus, any attempt in theory to apply strict scrutiny to gun regulations will in practice turn into an interest-balancing inquiry, with the interests protected by the Second Amendment on one side and the governmental public-safety concerns on the other, the only question being whether the regulation at issue impermissibly burdens the former in the course of advancing the latter.

I would simply adopt such an interest-balancing inquiry explicitly. The fact that important interests lie on both sides of the constitutional equation suggests that review of gun-control regulation is not a context in which a court should effectively presume either constitutionality (as in rational-basis review) or unconstitutionality (as in strict scrutiny). Rather, "where a law significantly implicates competing constitutionally protected interests in complex ways," the Court generally asks whether the statute burdens a protected interest in a way or to an extent that is out of proportion to the statute's salutary effects upon other important governmental interests. See Nixon v. Shrink Missouri Government PAC, 528 U. S. 377, 402 (2000) (BREYER, J., concurring). Any answer would take account both of the statute's effects upon the competing interests and the existence of any clearly superior less restrictive alternative. See ibid. Contrary to the majority's unsupported suggestion that this sort of "proportionality" approach is unprecedented, see ante, at 62, the Court has applied it in various constitutional contexts, including election-law cases, speech cases, and due process cases. See 528 U. S., at 403 (citing examples where the Court has taken such an approach); see also, e.g., Thompson v. Western States Medical Center, 535 U. S. 357, 388 (2002) (BREYER, J., dissenting) (commercial speech); Burdick v. Takushi, 504 U. S. 428, 433 (1992) (election regulation); Mathews v. Eldridge, 424 U. S. 319, 339-349 (1976) (procedural due process); Pickering v. Board of Ed. of Township High School Dist. 205, Will Cty., 391 U. S. 563, 568 (1968) (government employee speech).

In applying this kind of standard the Court normally defers to a legislature's empirical judgment in matters where a legislature is likely to have greater expertise and greater institutional factfinding capacity. See Turner Broadcasting System, Inc. v. FCC, 520 U. S. 180, 195-196 (1997); see also Nixon, supra, at 403 (BREYER, J., concurring). Nonetheless, a court, not a legislature, must make the ultimate constitutional conclusion, exercising its "independent judicial judgment" in light of the whole record to determine whether a law exceeds constitutional boundaries. Randall v. Sorrell, 548 U. S. 230, 249 (2006) (opinion of BREYER, J.) (citing Bose Corp. v. Consumers Union of United States, Inc., 466 U. S. 485, 499 (1984)).

The above-described approach seems preferable to a more rigid approach here for a further reason. Experience as much as logic has led the Court to decide that in one area of constitutional law or another the interests are likely to prove stronger on one side of a typical constitutional case than on the other. See, e.g., United States v. Virginia, 518 U. S. 515, 531-534 (1996) (applying heightened scrutiny to gender-based classifications, based upon experience with prior cases); Williamson v. Lee Optical of Okla., Inc., 348 U. S. 483, 488 (1955) (applying rational-basis scrutiny to economic legislation, based upon experience with prior cases). Here, we have little prior experience. Courts that do have experience in these matters have uniformly taken an approach that treats empirically-based legislative judgment with a degree of deference. See Winkler, Scrutinizing the Second Amendment, 105 Mich. L. Rev. 683, 687, 716-718 (2007) (describing hundreds of gun-law decisions issued in the last half-century by Supreme Courts in 42 States, which courts with "surprisingly little variation," have adopted a standard more deferential than strict scrutiny). While these state cases obviously are not controlling, they are instructive. Cf., e.g., Bartkus v. Illinois, 359 U. S. 121, 134 (1959) (looking to the "experience of state courts" as informative of a constitutional question). And they thus provide some comfort regarding the practical wisdom of following the approach that I believe our constitutional precedent would in any event suggest.

IV

The present suit involves challenges to three separate District firearm restrictions. The first requires a license from the District's Chief of Police in order to carry a "pistol," i.e., a handgun, anywhere in the District. See D. C. Code §22-4504(a) (2001); see also §§22-4501(a), 22-4506. Because the District assures us that respondent could obtain such a license so long as he meets the statutory eligibility criteria, and because respondent concedes that those criteria are facially constitutional, I, like the majority, see no need to address the constitutionality of the licensing requirement. See ante, at 58-59.

The second District restriction requires that the lawful owner of a firearm keep his weapon "unloaded and disassembled or bound by a trigger lock or similar device" unless it is kept at his place of business or being used for lawful recreational purposes. See §7-2507.02. The only dispute regarding this provision appears to be whether the Constitution requires an exception that would allow someone to render a firearm operational when necessary for self-defense (i.e., that the firearm may be operated under circumstances where the common law would normally permit a self-defense justification in defense against a criminal charge). See Parker v. District of Columbia, 478 F. 3d 370, 401 (2007) (case below); ante, at 57-58 (opinion of the Court); Brief for Respondent 52-54. The District concedes that such an exception exists. See Brief for Petitioners 56-57. This Court has final authority (albeit not often used) to definitively interpret District law, which is, after all, simply a species of federal law. See, e.g., Whalen v. United States, 445 U. S. 684, 687-688 (1980); see also Griffin v. United States, 336 U. S. 704, 716-718 (1949). And because I see nothing in the District law that would preclude the existence of a background common-law self-defense exception, I would avoid the constitutional question by interpreting the statute to include it. See Ashwander v. TVA, 297 U. S. 288, 348 (1936) (Brandeis, J., concurring).

I am puzzled by the majority's unwillingness to adopt a similar approach. It readily reads unspoken self-defense exceptions into every colonial law, but it refuses to accept the District's concession that this law has one. Compare ante, at 59-61, with ante, at 57-58. The one District case it cites to support that refusal, McIntosh v. Washington, 395 A. 2d 744, 755-756 (1978), merely concludes that the District Legislature had a rational basis for applying the trigger-lock law in homes but not in places of business. Nowhere does that case say that the statute precludes a self-defense exception of the sort that I have just described. And even if it did, we are not bound by a lower court's interpretation of federal law.

The third District restriction prohibits (in most cases) the registration of a handgun within the District. See §7- 2502.02(a)(4). Because registration is a prerequisite to firearm possession, see §7-2502.01(a), the effect of this provision is generally to prevent people in the District from possessing handguns. In determining whether this regulation violates the Second Amendment, I shall ask how the statute seeks to further the governmental interests that it serves, how the statute burdens the interests that the Second Amendment seeks to protect, and whether there are practical less burdensome ways of furthering those interests. The ultimate question is whether the statute imposes burdens that, when viewed in light of the statute's legitimate objectives, are disproportionate. See Nixon, 528 U. S., at 402 (BREYER, J., concurring).

A

No one doubts the constitutional importance of the statute's basic objective, saving lives. See, e.g., Salerno, 481 U. S., at 755. But there is considerable debate about whether the District's statute helps to achieve that objective. I begin by reviewing the statute's tendency to secure that objective from the perspective of (1) the legislature (namely, the Council of the District of Columbia) that enacted the statute in 1976, and (2) a court that seeks to evaluate the Council's decision today.

1

First, consider the facts as the legislature saw them when it adopted the District statute. As stated by the local council committee that recommended its adoption, the major substantive goal of the District's handgun restriction is "to reduce the potentiality for gun-related crimes and gun-related deaths from occurring within the District of Columbia." Hearing and Disposition before the House Committee on the District of Columbia, 94th Cong., 2d Sess., on H. Con. Res. 694, Ser. No. 94-24, p. 25 (1976) (herinafter DC Rep.) (reproducing, inter alia, the Council committee report). The committee concluded, on the basis of "extensive public hearings" and "lengthy research," that "[t]he easy availability of firearms in the United States has been a major factor contributing to the drastic increase in gun-related violence and crime over the past 40 years." Id., at 24, 25. It reported to the Council "startling statistics," id., at 26, regarding gun-related crime, accidents, and deaths, focusing particularly on the relation between handguns and crime and the proliferation of handguns within the District. See id., at 25-26.

The committee informed the Council that guns were "responsible for 69 deaths in this country each day," for a total of "[a]pproximately 25,000 gun-deaths . . . each year," along with an additional 200,000 gun-related injuries. Id., at 25. Three thousand of these deaths, the report stated, were accidental. Ibid. A quarter of the victims in those accidental deaths were children under the age of 14. Ibid. And according to the committee, "[f]or every intruder stopped by a homeowner with a firearm, there are 4 gun-related accidents within the home." Ibid.

In respect to local crime, the committee observed that there were 285 murders in the District during 1974-a record number. Id., at 26. The committee also stated that, "[c]ontrary to popular opinion on the subject, firearms are more frequently involved in deaths and violence among relatives and friends than in premeditated criminal activities." Ibid. Citing an article from the American Journal of Psychiatry, the committee reported that "[m]ost murders are committed by previously law-abiding citizens, in situations where spontaneous violence is generated by anger, passion or intoxication, and where the killer and victim are acquainted." Ibid. "Twenty-five percent of these murders," the committee informed the Council, "occur within families." Ibid.

The committee report furthermore presented statistics strongly correlating handguns with crime. Of the 285 murders in the District in 1974, 155 were committed with handguns. Ibid. This did not appear to be an aberration, as the report revealed that "handguns [had been] used in roughly 54% of all murders" (and 87% of murders of law enforcement officers) nationwide over the preceding several years. Ibid. Nor were handguns only linked to murders, as statistics showed that they were used in roughly 60% of robberies and 26% of assaults. Ibid. "A crime committed with a pistol," the committee reported, "is 7 times more likely to be lethal than a crime committed with any other weapon." Id., at 25. The committee furthermore presented statistics regarding the availability of handguns in the United States, ibid., and noted that they had "become easy for juveniles to obtain," even despite then-current District laws prohibiting juveniles from possessing them, id., at 26.

In the committee's view, the current District firearms laws were unable "to reduce the potentiality for gun-related violence," or to "cope with the problems of gun control in the District" more generally. Ibid. In the absence of adequate federal gun legislation, the committee concluded, it "becomes necessary for local governments to act to protect their citizens, and certainly the District of Columbia as the only totally urban statelike jurisdiction should be strong in its approach." Id., at 27. It recommended that the Council adopt a restriction on handgun registration to reflect "a legislative decision that, at this point in time and due to the gun-control tragedies and horrors enumerated previously" in the committee report, "pistols . . . are no longer justified in this jurisdiction." Id., at 31; see also ibid. (handgun restriction "denotes a policy decision that handguns . . . have no legitimate use in the purely urban environment of the District").

The District's special focus on handguns thus reflects the fact that the committee report found them to have a particularly strong link to undesirable activities in the District's exclusively urban environment. See id., at 25- 26. The District did not seek to prohibit possession of other sorts of weapons deemed more suitable for an "urban area." See id., at 25. Indeed, an original draft of the bill, and the original committee recommendations, had sought to prohibit registration of shotguns as well as handguns, but the Council as a whole decided to narrow the prohibition. Compare id., at 30 (describing early version of the bill), with D. C. Code §7-2502.02).

2

Next, consider the facts as a court must consider them looking at the matter as of today. See, e.g., Turner, 520 U. S., at 195 (discussing role of court as factfinder in a constitutional case). Petitioners, and their amici, have presented us with more recent statistics that tell much the same story that the committee report told 30 years ago. At the least, they present nothing that would permit us to second-guess the Council in respect to the numbers of gun crimes, injuries, and deaths, or the role of handguns.

From 1993 to 1997, there were 180,533 firearm-related deaths in the United States, an average of over 36,000 per year. Dept. of Justice, Bureau of Justice Statistics, M. Zawitz & K. Strom, Firearm Injury and Death from Crime, 1993-97, p. 2 (Oct. 2000), online at http:// www.ojp****doj.gov/bjs/pub/pdf/fidc9397.pdf (hereinafter Firearm Injury and Death from Crime). Fifty-one percent were suicides, 44% were homicides, 1% were legal interventions, 3% were unintentional accidents, and 1% were of undetermined causes. See ibid. Over that same period there were an additional 411,800 nonfatal firearm-related injuries treated in U. S. hospitals, an average of over 82,000 per year. Ibid. Of these, 62% resulted from assaults, 17% were unintentional, 6% were suicide attempts, 1% were legal interventions, and 13% were of unknown causes. Ibid.

The statistics are particularly striking in respect to children and adolescents. In over one in every eight firearm-related deaths in 1997, the victim was someone under the age of 20. American Academy of Pediatrics, Firearm-Related Injuries Affecting the Pediatric Population, 105 Pediatrics 888 (2000) (hereinafter Firearm-Related Injuries). Firearm-related deaths account for 22.5% of all injury deaths between the ages of 1 and 19. Ibid. More male teenagers die from firearms than from all natural causes combined. Dresang, Gun Deaths in Rural and Urban Settings, 14 J. Am. Bd. Family Practice 107 (2001). Persons under 25 accounted for 47% of hospital-treated firearm injuries between June 1, 1992 and May 31, 1993. Firearm-Related Injuries 891.

Handguns are involved in a majority of firearm deaths and injuries in the United States. Id., at 888. From 1993 to 1997, 81% of firearm-homicide victims were killed by handgun. Firearm Injury and Death from Crime 4; see also Dept. of Justice, Bureau of Justice Statistics, C. Perkins, Weapon Use and Violent Crime, p. 8 (Sept. 2003), (Table 10), http://www.ojp****doj.gov/bjs/pub/pdf/wuvc01. pdf (hereinafter Weapon Use and Violent Crime) (statistics indicating roughly the same rate for 1993-2001). In the same period, for the 41% of firearm injuries for which the weapon type is known, 82% of them were from handguns. Firearm Injury and Death From Crime 4. And among children under the age of 20, handguns account for approximately 70% of all unintentional firearm-related injuries and deaths. Firearm-Related Injuries 890. In particular, 70% of all firearm-related teenage suicides in 1996 involved a handgun. Id., at 889; see also Zwerling, Lynch, Burmeister, & Goertz, The Choice of Weapons in Firearm Suicides in Iowa, 83 Am. J. Public Health 1630, 1631 (1993) (Table 1) (handguns used in 36.6% of all firearm suicides in Iowa from 1980-1984 and 43.8% from 1990-1991).

Handguns also appear to be a very popular weapon among criminals. In a 1997 survey of inmates who were armed during the crime for which they were incarcerated, 83.2% of state inmates and 86.7% of federal inmates said that they were armed with a handgun. See Dept. of Justice, Bureau of Justice Statistics, C. Harlow, Firearm Use by Offenders, p. 3 (Nov. 2001), online at http://www.ojp****doj.gov/bjs/pub/pdf/fuo.pdf; see also Weapon Use and Violent Crime 2 (Table 2) (statistics indicating that handguns were used in over 84% of nonlethal violent crimes involving firearms from 1993 to 2001). And handguns are not only popular tools for crime, but popular objects of it as well: the FBI received on average over 274,000 reports of stolen guns for each year between 1985 and 1994, and almost 60% of stolen guns are handguns. Dept. of Justice, Bureau of Justice Statistics, M. Zawitz, Guns Used in Crime, p. 3 (July 1995), online at http://www.ojp****doj.gov/bjs/pub/pdf/guic.pdf. Department of Justice studies have concluded that stolen handguns in particular are an important source of weapons for both adult and juvenile offenders. Ibid.

Statistics further suggest that urban areas, such as the District, have different experiences with gun-related death, injury, and crime, than do less densely populated rural areas. A disproportionate amount of violent and property crimes occur in urban areas, and urban criminals are more likely than other offenders to use a firearm during the commission of a violent crime. See Dept. of Justice, Bureau of Justice Statistics, D. Duhart, Urban, Suburban, and Rural Victimization, 1993-98, pp. 1, 9 (Oct. 2000), online at http://www.ojp****doj.gov/bjs/pub/pdf/ usrv98.pdf. Homicide appears to be a much greater issue in urban areas; from 1985 to 1993, for example, "half of all homicides occurred in 63 cities with 16% of the nation's population." Wintemute, The Future of Firearm Violence Prevention, 282 JAMA 475 (1999). One study concluded that although the overall rate of gun death between 1989 and 1999 was roughly the same in urban than rural areas, the urban homicide rate was three times as high; even after adjusting for other variables, it was still twice as high. Branas, Nance, Elliott, Richmond, & Schwab, Urban-Rural Shifts in Intentional Firearm Death, 94 Am. J. Public Health 1750, 1752 (2004); see also ibid. (noting that rural areas appear to have a higher rate of firearm suicide). And a study of firearm injuries to children and adolescents in Pennsylvania between 1987 and 2000 showed an injury rate in urban counties 10 times higher than in nonurban counties. Nance & Branas, The Rural-Urban Continuum, 156 Archives of Pediatrics & Adolescent Medicine 781, 782 (2002).
Finally, the linkage of handguns to firearms deaths and injuries appears to be much stronger in urban than in rural areas. "[S]tudies to date generally support the hypothesis that the greater number of rural gun deaths are from rifles or shotguns, whereas the greater number of urban gun deaths are from handguns." Dresang, supra, at 108. And the Pennsylvania study reached a similar conclusion with respect to firearm injuries-they are much more likely to be caused by handguns in urban areas than in rural areas. See Nance & Branas, supra, at 784.
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