UPDATE: Dumb asses at the Justice Department/White House take notice: Its already federal law that aliens must always carry their green card with them
http://hotair.com/archives/2010/04/24/correction-the-actual-arizona-immigration-bill/A. IN ADDITION TO ANY VIOLATION OF FEDERAL LAW, A PERSON IS GUILTY OF WILLFUL FAILURE TO COMPLETE OR CARRY AN ALIEN REGISTRATION DOCUMENT IF THE PERSON IS IN VIOLATION OF 8 UNITED STATES CODE SECTION 1304(e) OR 1306(a).