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Some of them, in fact, are trying to get into the drug-testing business.Dobie worked for Kroll Laboratory Specialists, a Gretna, La., drug-testing lab.Your body’s own detoxification process will cleanse your blood and urine naturally over time.THC is fat soluble, which means the traces of it are stored in your fat cells and remain in your system over time depending on the factors we listed above.He recalls a time when a prospective co-worker failed a pre-employment drug test.“We had someone come in an interview with us and they were a great candidate — great GPA, came from a great university, and they failed for cocaine.” Dobie figures the candidate had probably done cocaine very shortly before the interview.Hair tests can detect THC and other substances in your head and body hair for months or even years after usage, depending on the test—although most labs take a 1.5-inch sample of head hair, which detects usage back roughly 90 days.
By far, the most common type of drug test is still urine analysis.
According to Thomas Dobie, who used to work in a drug testing lab, you’d have to be an idiot to fail a drug test for cocaine.
“Cocaine, honestly, if you do it infrequently — maybe on a Friday night when you go out with your friends — it’s only in your system for 24 hours,” he says.
If you smoked once over the weekend with a friend, for example, pot can be out of your system in as little as two days, although on average it can take up to 10 days.
Most other drugs can stay in your system for a few days up to a month in extreme cases.