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Criminal Law

Commonwealth v. Alvarez

But sometimes a legislature expressly declines to provide any mens rea for a given element. The prosecution still has to prove the element, but just not prove that the defendant knew or otherwise had some mens rea with respect to that element. 

Commonwealth v. Alvarez provides an example. The defendant argued it was unfair to punish him for something he was unaware of, but the court said the legislature had the power to do so. You can also discern from the case why a legislature might want to provide no mens rea for a particular element--i.e., make the crime strict liability as to that element.