It all depends on the test they do. im sure if they want find somthing they will !!hair test cannot be beat (unless u take a razor to your dreds)!! but do they send it all of to the lab or is it a scare tactic? i was tested positive and just claimed i may hav been in a room at the time it was smoked and i got away with it. well i guess i was lucky and did not get laid off. but in my mind i dont want to be working somewhere that is so harsh -so i left the job within a month. The life you live at home will in the end effect where you work-its a give and take situation and if you cannot avoid it then i feel you. my 2 pence not cent . ukblazer