for statutes that affect marriage and childbearing). The concession is prudent, and we need not get more deeply into the “levels of scrutiny” quagmire, for no one doubts that the goal of § 922(g)(9), preventing armed mayhem, is an important governmental objective. Both logic and data establish a substantial relation between § 922(g)(9) and this objective.
“Misdemeanor crime of domestic violence” is a defined term.
(A) Except as provided in subparagraph (C), the term “misdemeanor crime of domestic violence” means an offense that—
(i) is a misdemeanor under Federal, State, or Tribal law; and
(ii) has, as an element, the use or attempted use of physical force, or the threatened use of a deadly weapon, committed by a current or former spouse, parent, or guardian of the victim, by a person with whom the victim shares a child in common, by a person who is cohabiting with or has cohabited with the victim as a spouse, parent, or guardian, or by a person similarly situated to a spouse, parent, or guardian of the victim.
(B) (i) A person shall not be considered to have been convicted of such an offense for purposes of this chapter, unless—
(I) the person was represented by counsel in the case, or knowingly and intelligently waived the right to counsel in the case; and
(II) in the case of a prosecution for an offense described in this paragraph for which a person was entitled to a jury trial in the jurisdiction in which the case was tried, either
(aa) the case was tried by a jury, or
(bb) the person knowingly and intelligently waived the right to have the case tried by a jury, by guilty plea or otherwise.
(ii) A person shall not be considered to have been convicted of such an offense for purposes of this chapter if the conviction has been expunged or set aside, or is an offense for which the person has been pardoned or has had civil rights restored (if the law of the applicable jurisdiction provides for the loss of civil rights under such an offense) unless the pardon, expungement, or restoration of civil rights expressly provides that the person may not ship, transport, possess, or receive firearms.
18 U.S.C. § 921(a)(33). A “misdemeanor crime of domestic violence” thus is one in which violence (actual or attempted) is an element of the offense; it is not enough if a risky act happens to cause injury. Cf. Begay v. United States, 553 U.S. 137, 128 S.Ct. 1581, 170 L.Ed.2d 490 (2008); Johnson v. United States, — U.S. -, 130 S.Ct. 1265, 176 L.Ed.2d 1 (2010); United States v. Howell, 531 F.3d 621 (8th Cir. 2008) (applying Begay to § 921(a)(33)).
The belief underpinning § 922(g)(9) is that people who have been convicted of violence once — toward a spouse, child, or domestic partner, no less — are likely to use violence again. That’s the justification for keeping firearms out of their hands, for guns are about five times more deadly than knives, given that an attack with some kind of weapon has occurred. See Franklin E. Zimring, Firearms, Violence, and the Potential Impact of Firearms Control, 32 J.L. Med. & Ethics 34 (2004) (collecting studies).
Hayes, which we mentioned above, held that whether a crime is one of “domestic violence” depends on the identity of the victim rather than the elements of the offense. When describing why § 922(g)(9) was enacted, the Court wrote (129 S.Ct. at 1087):
Existing felon-in-possession laws, Congress recognized, were not keeping fire