The Limitations on Federal Criminal Statutes

The only criminal statutes that the federal government can enact are those that are pertain in some way to a clause of the Constitution. There aren't any general statutes against murder. The only one was after President Kennedy was shot. They enacted, you can't, the law against shooting the president in 1965 and then against shooting members of Congress after Robert Kennedy was shot in 1968. But indeed, 95% of all criminal statutes are state laws.