The alcohol bit is completely untrue. Drug tests DO test for alcohol, but it stays in your system for a much shorter period than marijuana, opiads, amphetamines, etc. Something about a half life and science stuff I don't get. But my papi worked many years in HR and had to administer many tests for alcohol and drugs. If it is a blood test, you can test for anything. Hair samples are even better, but you can only go back so far (in terms of months). I believe you can go back years (maybe forever) in your hair follicles. As far as "it should be legal so let them do it" argument...I don't agree. Private business can, and should be able to test for whatever they want. In the eyes of the federal law, marijuana is illegal EVERYWHERE, regardless of what state law is. My senior government kids get pissed about this all the time, but I MAKE them understand that federal law supersedes state law. Just ask John C. Calhoun, Jefferson Davis, and the Confederacy about laws and who tells who what to do. That is my government/law and justice rant for today