3 doctors weighed in:

How can you clean THC out of your system before a drug test?

3 doctors weighed in
Dr. Cynthia Rector
Psychiatry
2 doctors agree

In brief: Stop Taking it

How long marijuana is detected in the urine depends strongly on frequency of use.
In regular users (more than once a week), the marijuana metabolite THC-COOH builds up to a high level, often on the order of hundreds of nanograms per milliliter (ng/ml), from which it may take weeks to decline back below the threshold of detection. The situation is different for occasional users (no more than once a week), who often clear up in a couple of days.

In brief: Stop Taking it

How long marijuana is detected in the urine depends strongly on frequency of use.
In regular users (more than once a week), the marijuana metabolite THC-COOH builds up to a high level, often on the order of hundreds of nanograms per milliliter (ng/ml), from which it may take weeks to decline back below the threshold of detection. The situation is different for occasional users (no more than once a week), who often clear up in a couple of days.
Dr. Cynthia Rector
Dr. Cynthia Rector
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