The Justice Department is defending its prosecution of a man for owning a gun despite regularly using marijuana. Does that violate the Second Amendment?

WASHINGTON − The drinking habits of the founding fathers were fodder for the Supreme Court on March 2 as the justices wrestled with whether someone’s use of marijuana and other drugs makes them too da...

Over the course of nearly two hours of argument, a majority of justices — both conservative and liberal — signaled that they believed federal prosecutors overreached when they charged a Texas man with...