Nonsense:
Last season, when defensive tackle DeMarcus Dobbs was arrested on similar charges after a single-car accident, they left him at home while the rest of the team traveled to St. Louis.
http://profootballtalk.nbcsports.com/2013/09/20/add-possession-of-marijuana-to-aldon-smiths-list/
Maybe they can't suspend him but they can discipline him.