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if you took one hit of a joint would you test positive for marijuana and how long did drugs stay in your system [Music] Im Joe Riley president of national drug screening welcome to our video blog series today were going to talk about drug testing in relation to what we call cut-off levels and detection times so well start with cutoff levels when we get a urine specimen or a hair specimen for a drug test at the laboratory theyre testing for the metabolites of the various drugs the metabolites of the drug is what the drug broke down into into your body as you smoked it or inject it or it swallowed it and it the metabolites form in your urine or in your hair and at the laboratories they have cut-off levels and so if the level of the metabolites in your specimen is above a certain number thats a positive if the level of the metabolite is below a certain number thats a negative now theres various cutoff levels for the various drugs and the reason is cutoff levels is to give every be