¶1— Zachary Schmidt appeals his conviction for unlawful possession of a firearm. He claims he was convicted in violation of the ex post facto clause. We affirm. In 1988, Schmidt was convicted of second degree assault. *299The law in effect at that time did not bar one convicted of second degree assault from possessing a rifle.
¶2In 1994, the legislature amended RCW 9.41.040 to make it a felony for a person previously convicted of second degree assault to possess a rifle.
¶3In 1997, Schmidt was arrested while possessing a rifle. A day or two later, the State charged him under the 1994 amendment.
¶4In 1998, Schmidt was convicted by a jury. Later, he was sentenced to prison for 36 months.
¶5The only issue on appeal is whether Schmidt was convicted in violation of the ex post facto clause. That clause provides that no state shall pass any ex post facto law.
¶6Whether a law is “ex post facto” turns on two basic questions: (1) Is the law “criminal” or “punitive,” as opposed to “civil” or “non-punitive”? (2) If the law is “criminal” or “punitive,” does it punish past or future conduct?
¶7*300If a law is not “criminal” or “punitive,” it can be applied to any conduct, either past or future, without violating the ex post facto clause. As the United States Supreme Court explained in Kansas v. Hendricks, “The Ex Post Facto Clause, which ‘forbids the application of any new punitive measure to a crime already consummated,’ has been interpreted to pertain exclusively to penal statutes.”
¶8*301If a law is “criminal” or “punitive,” it can be applied to future conduct without violating the ex post facto clause. As the United States Supreme Court explained in McDonald v. Massachusetts, “The statute, imposing a punishment on none but future crimes, is not ex post facto.”
¶9If a law is “criminal” or “punitive,” however, it cannot be applied to past conduct without violating the ex post facto clause.
1st. Every law that makes an action, done before the passing of the law, and which was innocent when done, criminal ; and punishes such action. 2d. Every law that aggravates a crime, or makes it greater than it was, when committed. 3d. Every law that changes the punishment, and inflicts a greater punishment, than the law annexed to the crime, when committed.[10 ]
¶10These concepts have been imprecisely expressed by saying that “A law violates the ex post facto clause if it: (1) is substantive, as opposed to merely procedural; (2) is retrospective (applies to events which occurred before its enactment); and (3) disadvantages the person affected by it.”
¶11In this case, the 1994 amendment is both criminal and punitive. From and after its 1994 effective date, it provided that a person previously convicted of second degree assault would be guilty of a felony and subject to a prison term if he or she possessed a rifle. In 1997, it served as the legal basis for convicting Schmidt and sentencing him to prison. A law simply cannot be more criminal or punitive than that.
¶12The remaining question is whether the 1994 amendment punishes past or future conduct. If it punishes only future conduct, it does not offend the ex post facto clause, even though it is criminal and punitive.
¶13*303In State v. Watkins,
¶14Other jurisdictions hold likewise,
Some ex post facto questions of the increased-punishment type have arisen in connection with the passage of habitual criminal laws, which impose enhanced penalties for later offenses if the defendant has previously been convicted of one or more crimes. If the defendant commits crime A at a time when there is no habitual criminal statute, then such a statute is passed imposing increased punishment for a second offense, and then the defendant commits crime B, it is not within the ex post *304facto prohibition to apply the habitual criminal statute to crime B. No additional punishment is prescribed for crime A, but only the new crime B, which was committed after the statute was passed.[19 ]
¶15Attempting to distinguish these authorities, Schmidt asserts that the 1994 amendment punishes his 1988 conduct, which is “past” conduct with reference to the 1994 amendment. Like Division One, however, we think that the State is punishing Schmidt not for his 1988 conduct, but rather for his 1997 conduct. If he had not engaged in his 1997 conduct, he would not be punished at all.
¶16As the preceding paragraph shows, we have no quarrel with the concurrence’s position that the 1994 amendment does not punish Schmidt for his 1988 conduct.
¶17We would ignore this flaw as merely semantical if its consequences for the ex post facto clause were not so serious. To characterize a treatment statute as nonpunitive is to leave intact the clause’s protection against punitive statutes.
¶18In conclusion, we hold that the 1994 amendment is punitive. We further hold that it punishes future conduct (i.e., conduct occurring after its effective date), not past conduct (i.e., conduct occurring before its effective date). As a result, Schmidt’s conviction did not violate the ex post facto clause.
¶19Affirmed.
¶20Houghton, J., concurs.
¶21The law did bar such a person from possessing a pistol or “short firearm,” Laws op 1983, ch. 232, § 2, but that fact is immaterial here.
¶22Laws op 1994, 1st Spec. Sess., ch. 7, § 407, effective June 13, 1994, amending RCW 9.41.040.
¶23U.S. Const, art. I, § 10; see also U.S. Const, art. I, § 9 (“No ... ex post facto law” shall be passed by Congress); Wash. Const, art. I, § 23.
¶24Weaver v. Graham, 450 U.S. 24, 28-29, 101 S. Ct. 960, 67 L. Ed. 2d 17 (1981).
¶25Forster v. Pierce County, 99 Wn. App. 168, 178, 991 P.2d 687 (2000); see also Weaver, 450 U.S. at 29 (“two critical elements must be present for a criminal or penal law to be ex post facto: it must be retrospective, that is, it must apply to events occurring before its enactment, and it must disadvantage the offender”) (footnote omitted).
¶26Weaver, 450 U.S. at 29 (law is “retrospective” for purposes of ex post facto if it “appl[ies] to events occurring before its enactment”); State v. Aho, 137 Wn.2d *300736, 742, 975 P.2d 512 (1999) (“To fall within the ex post facto prohibition, a law must be retrospective — that is ‘it must apply to events occurring before its enactment’ . . . .”) (quoting Lynce v. Mathis, 519 U.S. 433, 441, 117 S. Ct. 891, 137 L. Ed. 2d 63 (1997); In re Personal Restraint of Stanphill, 134 Wn.2d 165, 170, 949 P.2d 365 (1998) (“A law is retrospective if it ‘changes the legal consequences of acts completed before its effective date.’ ”) (quoting Miller v. Florida, 482 U.S. 423, 430, 107 S. Ct. 2446, 96 L. Ed. 2d 351 (1987)); Addleman v. Board of Prison Terms & Paroles, 107 Wn.2d 503, 506, 730 P.2d 1327 (1986) (same); Forster, 99 Wn. App. at 178; State v. Randle, 47 Wn. App. 232, 240, 734 P.2d 51 (1987) (same), review denied, 110 Wn.2d 1008 (1988); see also Calder v. Bull, 3 U.S. (3 Dall.) 386, 390-92, 1 L. Ed. 648 (1798).
¶27Kansas v. Hendricks, 521 U.S. 346, 370, 117 S. Ct. 2072, 138 L. Ed. 2d 501 (1997) (quoting Lindsey v. Washington, 301 U.S. 397, 401, 57 S. Ct. 797, 81 L. Ed. 1182 (1937)); see also Collins v. Youngblood, 497 U.S. 37, 41, 43, 110 S. Ct. 2715, 111 L. Ed. 2d 30 (1990) (“[I]t has long been recognized by this Court that the constitutional prohibition on ex post facto laws applies only to penal statutes . . .”; “Legislatures may not retroactively alter the definition of crimes or increase the punishment for criminal acts.”); In re Personal Restraint of Young, 122 Wn.2d 1, 24, 857 P.2d 989 (1993) (“Because the statute is civil . . . the ex post facto prohibition does not apply.”); Forster, 99 Wn. App. at 179; United States v. O’Neal, 180 F.3d 115, 122 (4th Cir. 1999) (“While laws that retroactively increase ‘punishment’ or impose a ‘penalty’ violate the Ex Post Facto Clause, retroactive civil or regulatory ones do not.”), cert. denied, 528 U.S. 980 (1999); Russell v. Gregoire, 124 F.3d 1079, 1084, 1086-87 (9th Cir. 1997) (registration and notification requirements under sex offender statute not subject to ex post facto clause), cert. denied, 523 U.S. 1007 (1998); Doe v. Pataki, 120 F.3d 1263, 1272 (2d Cir. 1997) (“[T]he Ex Fost Facto Clause of the Constitution ‘applies only to penal statutes which disadvantage the offender affected by them.’ ”) (citing Collins, 497 U.S. at 41)), cert. denied, 522 U.S. 1122 (1998); State v. Ward, 123 Wn.2d 488, 499, 869 P.2d 1062 (1994) (registration and notification requirements under sex offender statute not subject to ex post facto clause; “The ex post facto prohibition applies only to laws inflicting criminal punishment.’’).
¶28Parenthetically, two factors determine whether a law is criminal or punitive. One is the legislature’s intent; the other is the law’s effect. E.g. Hendricks, 521 U.S. at 361 (“Although we recognize that a ‘civil label is not always dispositive,’ we will reject the legislature’s manifest intent only where a party challenging the statute provides ‘the clearest proof’ that ‘the statutory scheme [is] so punitive either in purpose or effect as to negate [the State’s] intention’ to deem it ‘civil.’ ” (citation omitted) (quoting United States v. Ward, 448 U.S. 242, 248-49, 100 S. Ct. 2636, 65 L. Ed. 2d 742 (1980)); United States v. Newman, 144 F.3d 531, 540 (7th Cir. 1998) (same); Russell, 124 F.3d at 1087 (“When examining whether a law violates the Ex Post Facto Clause, we inquire whether (1) the legislature intended *301the sanction to be punitive, and (2) the sanction is ‘so punitive’ in effect as to prevent the court from legitimately viewing it as regulatory or civil in nature, despite the legislature’s intent.”); Ward, 123 Wn.2d at 499, 510-11.
¶29McDonald v. Massachusetts, 180 U.S. 311, 313, 21 S. Ct. 389, 45 L. Ed. 542 (1901); see also Russell, 124 F.3d at 1088-89; Forster, 99 Wn. App. at 179; State v. Watkins, 76 Wn. App. 726, 732, 887 P.2d 492 (1995); 1 Wayne R. LaFave & Austin W. Scott, Jr., Substantive Criminal Law § 2.4(a), at 139 (1986).
¶30Calder, 3 U.S. (3 Dall.) at 390-92; Forster, 99 Wn. App. at 179.
¶31Calder, 3 U.S. (3 Dall.) at 390; see also Collins, 497 U.S. at 42, 43 n.3; Dobbert v. Florida, 432 U.S. 282, 292, 97 S. Ct. 2290, 53 L. Ed. 2d 344, reh’g denied, 434 U.S. 882 (1977); Beazell v. Ohio, 269 U.S. 167, 169-70, 46 S. Ct. 68, 70 L. Ed. 216 (1925); Aho, 137 Wn.2d at 742 n.1; Ward, 123 Wn.2d at 497; Young, 122 Wn.2d at 23; State v. Handran, 113 Wn.2d 11, 14, 775 P.2d 453 (1989); State v. Edwards, 104 Wn.2d 63, 70-71, 701 P.2d 508 (1985). We omit a fourth category, pertaining to the rules of evidence, for the reasons discussed in Collins, 497 U.S. 37.
¶32State v. Hennings, 129 Wn.2d 512, 525, 919 P.2d 580 (1996); Ward, 123 Wn.2d at 496; In re Personal Restraint of Powell, 117 Wn.2d 175, 185, 814 P.2d 635 (1991), cert. denied, 516 U.S. 825 (1995); State v. Ashcraft, 71 Wn. App. 444, *302451, 859 P.2d 60 (1993); see also Stanphill, 134 Wn.2d at 170-71; State v. Serio, 97 Wn. App. 586, 588, 987 P.2d 133 (1999).
¶33Collins, 497 U.S. at 44, 46 (procedural law is not ex post facto if “[i]t does not alter the definition of the crime” or “increase the punishment”; but “by simply labeling a law ‘procedural,’ a legislature does not thereby immunize it from scrutiny under the Ex Post Facto Clause”); Forster, 99 Wn. App. at 180; 1 LaFave & Scott, supra, § 2.4(a), at 140 n.30 (“some procedural changes may . . . come under the ex post facto ban”). According to the United States Supreme Court, the distinction between “procedural” and “substantive” laws “has imported confusion into the interpretation of the Ex Post Facto Clause.” Collins, 497 U.S. at 45. See also Stanphill, 134 Wn.2d at 170 (“the application of determinate sentencing to a pre-SRA offender” is “substantive” where it “alters the sentencing scheme”).
¶34Weaver, 450 U.S. at 29; Aho, 137 Wn.2d at 742; Stanphill, 134 Wn.2d at 170; Addleman, 107 Wn.2d at 506; Forster, 99 Wn. App. at 180; Randle, 47 Wn. App. at 240; see also Calder, 3 U.S. (3 Dall.) at 390-92.
¶35Collins, 497 U.S. at 41 (“constitutional prohibition on ex post facto laws applies only to penal statutes which disadvantage the offender affected by them”) (emphasis added)); Weaver, 450 U.S. at 29 (to be ex post facto, law “must disadvantage the offender” (emphasis added)); Stanphill, 134 Wn.2d at 170 (whether person is “disadvantaged” depends on “whether the law alters the standard of punishment which existed under prior law”); Hennings, 129 Wn.2d at 525-26 (same as Stanphill-, and further, “the proper inquiry is not whether the law is . . . ‘disadvantageous’ to the defendant, but whether it makes more burdensome the punishment for the crime”); Ward, 123 Wn.2d at 498 (same as Stanphill)-, Forster, 99 Wn. App. at 180; see also Calder, 3 U.S. (3 Dall.) at 390-92.
¶36Watkins, 76 Wn. App. 726, 732, 887 P.2d 492 (1995).
¶37Watkins, 76 Wn. App. at 732; accord, Cases v. United States, 131 F.2d 916, 921 (1st Cir. 1942), cert. denied, 319 U.S. 770 (1943); United States v. Huss, 7 F.3d 1444 (9th Cir. 1993); Forster, 99 Wn. App. at 181; State v. Tully, 198 Wash. 605, 607, 89 P.2d 517 (1939); State v. Le Pitre, 54 Wash. 166, 168, 103 P. 27 (1909); but see United States v. Davis, 936 F.2d 352, 356 (8th Cir. 1991), cert. denied, 503 U.S. 908 (1992).
¶38Schmidt contends that Watkinsis both wrong and distinguishable. We disagree on both counts.
¶39United States v. Karnes, 437 F.2d 284, 289-90 (9th Cir.) (firearms statute not ex post facto where Congress merely restricted future activities), cert. denied, 402 U.S. 1008 (1971); United States v. Sutton, 521 F.2d 1385, 1390 (7th Cir. 1975) (firearms statute not ex post facto where it “does not criminalize an act done before its passage”); Smith v. United States, 312 F.2d 119, 120-21 (10th Cir. 1963) (same); State v. Williams, 358 So. 2d 943, 946 (La. 1978) (Louisiana statute not ex post facto, even though it “prohibits specified future conduct, the carrying of a concealed weapon”); but see Davis, 936 F.2d at 356.
¶401 LaFave & Scott, supra, § 2.4(a), at 139.
¶41See also LaFave & Scott, supra (“no additional punishment is prescribed for crime A”).
¶42See Concurrence at 307 (first sentence of last paragraph).
¶43See Kansas v. Hendricks, 521 U.S. at 370 (“The Ex Post Facto Clause, which ‘forbids the application of any new punitive measure to a crime already consummated,’ has been interpreted to pertain exclusively to penal statutes.”); Young, 122 Wn.2d at 24 (“Because the statute is civil . . . the ex post facto prohibition does not apply.”).
¶44See Russell, 124 F.3d 1079, 1087-89 (distinguishing the statute that does no more than require registration, from the statute that punishes nonregistration as a felony).