Summary

Joseph McKenna Shevlin-Carpenter Company v. Minnesota…

It is true that the police power of a state is the least limitable of its powers, but even it may not transcend the prohibition of the Constitution of the United States. If, as contended, intent is an essential element of crime, or, more restrictively, if intent is essential to the legality of penalties, it must be so, no matter under what power of the state they are prescribed. Plaintiffs in error, while considering there may be exceptions to the principle contended for in the exercise of the police power, urge that the legislation in controversy is not of that character.
Source: Wikisource

Joseph McKenna Shevlin-Carpenter Company v. Minnesota…

The argument made to sustain the contention that the act must be considered single, and that to treat its provisions as separable would destroy its integrity and defeat the purpose of the legislature, is somewhat elaborate. Its basic elements are that the statute is penal, and its provisions for damages and for fine and imprisonment are punishments for the same act of wrongdoing, designed as such, and intended to be inseparable, and that the statute therefore subjects an offender to a double jeopardy.
Source: Wikisource

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