616
Opinion of the Court
Congress where, as here, it would mean easing the path to convicting persons whose conduct would not even alert them to the probability of strict regulation in the form of a statute such as § 5861(d).
C
The potentially harsh penalty attached to violation of § 5861(d)—up to 10 years' imprisonment—confirms our reading of the Act. Historically, the penalty imposed under a statute has been a significant consideration in determining whether the statute should be construed as dispensing with mens rea. Certainly, the cases that first defined the concept of the public welfare offense almost uniformly involved statutes that provided for only light penalties such as fines or short jail sentences, not imprisonment in the state penitentiary. See, e. g., Commonwealth v. Raymond, 97 Mass. 567 (1867) (fine of up to $200 or six months in jail, or both); Commonwealth v. Farren, 91 Mass. 489 (1864) (fine); People v. Snowburger, 113 Mich. 86, 71 N. W. 497 (1897) (fine of up to $500 or incarceration in county jail).12
As commentators have pointed out, the small penalties attached to such offenses logically complemented the absence of a mens rea requirement: In a system that generally re-evidence, including any external indications signaling the nature of the weapon. And firing a fully automatic weapon would make the regulated characteristics of the weapon immediately apparent to its owner. In short, we are confident that when the defendant knows of the characteristics of his weapon that bring it within the scope of the Act, the Government will not face great difficulty in proving that knowledge. Of course, if Congress thinks it necessary to reduce the Government's burden at trial to ensure proper enforcement of the Act, it remains free to amend § 5861(d) by explicitly eliminating a mens rea requirement.
12 Leading English cases developing a parallel theory of regulatory offenses similarly involved violations punishable only by fine or short-term incarceration. See, e. g., Queen v. Woodrow, 15 M. & W. 404, 153 Eng. Rep. 907 (Ex. 1846) (fine of £200 for adulterated tobacco); Hobbs v. Winchester Corp., [1910] 2 K. B. 471 (maximum penalty of three months' imprisonment for sale of unwholesome meat).
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