DD is incoming Plebe to West Point and before receiving her appt. we purchased her tickets to Firefly- a 4 day concert that she has wanted to go to for years but there was always something preventing her from going like Girls State, sports, mom/dads fears. Concert is two weeks before R-day. She really wants to go but is concerned others around her smoking marijuana will have her come up hot in a test. She is a serious athlete and straight as an arrow but she cannot control what others do around her. I have tried to research second hand smoke and different studies produced different results. I guess I am looking for any references to something like this happening. I would hate for 4 days of fun and someones poor choices to destroy her dreams. This was going to be her big reward before signing the next 9 years away to Uncle Sam. Advice?