The U.S. Supreme Court on Wednesday tossed out Maine's law taxing the Internet sales of tobacco products, a statute intended to keep cigarettes out of minors' hands by regulating transportation companies. In a unanimous ruling, the justices concluded the federal government's overall interstate commerce authority trumped the state's public health policing powers. A federal appeals court earlier had found the law unconstitutional. "Despite the importance of the public health objective, we cannot agree with Maine," said Justice Stephen Breyer, writing for the majority. Federal law says "nothing about a public health exception," he noted. Maine's Legislature passed the law four...