Well the thing is im pretty sure i am taking a gc/ms test since I'll be taking the test at basic training for the Navy. First day you get there you take a gc/ms piss test (plz correct me if im wrong). I already know I can pass a at home drug test. Ive passed one of those after a week and a half without smoking before; it was a faded line though if that means anything. But this gc/ms test has me worried.