The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

Probably one of the more controversial Amendments as many seem to believe that it means unless something is SPECIFICALLY listed in the COTUS that means the federal government can't do it, when clearly that is not the case.

Strangely enough , it usually works out that what people claim the government can't do is what they don't want the government to do while at the same time being okay with the government doing things they want them to do.