Short answer: No.
Longer answer: See this interesting post by Ilya Somin, a respected libertarian law prof.
UPDATE (3/22/16): On the question whether “shall” means “must”, click here.
Tomorrow morning I have the honor and pleasure of joining host John Dankosky, his colleague Colin McEnroe and two additional great guests on The Wheelhouse, WNPR’s weekly news roundtable. Topics include Justice Scalia and the state budget. Listen live at 9:00 am!