text: How long a drug stays in you system is beside the point. What matter most is what kind of lab test will be performed to determine.\n\nTHE DRUG ITSELF can stay in your bloodstream up to 72 hours. However, most labs look for the metabolite, which is something that the body produces when it ingests something, in the case of cocaine it is "benzoylecgonine" that will stay around long after the drug is gone, up to 30 days for a frequent user.\n\nIf the lab prefer to take hair as a sample, cocaine can stay in your hair up to about 90 days. Nevertheless, new information is becomming apparent suggesting cocaine stay's in your hair about 25 years - even after you have only taken it once.\n\nAnd if you boyfriend has smoked weed, he definately don't have a chance. A minimum of thirty (30) days, minimum!\n\nAs medical science and employers become more and more aware of the problem exsisting in drug testing, they are choosing more complex, sophisicated testing methods. With these techniques and equipment, the only sure way to pass a test is to not do drugs and stay clear away from them.\n\nHope this answers your question!