Clarence Thomas, Alderman v. United States (562 U.S.…
“ Lopez marked the first time in half a century that this Court held that an Act of Congress exceeded its commerce power. We identified three categories of activity that Congress' commerce power authorizes it to regulate: (1) the use of the channels of interstate commerce; (2) the instrumentalities of interstate commerce; and (3) "activities having a substantial relation to interstate commerce...i.e., those activities that substantially affect interstate commerce." ”
