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As an someone who works for an employer that processes drug screens a lot, the urine tests aren't that accurate (like someone else said), but they are the cheapest. Also instant tests can be really faulty. But in general, THC stays in the system about 3 weeks unless the person is overweight or a habitual smoker. Then it can take a long time to be out of the system. The tests are more accurate but a lot more expensive. Generally companies that do the hair tests are smarter than to take hair from your head, (unless that is the only option) They usually take the hair from an arm or leg.
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