Sunday, November 04, 2018

How Long Can Marijuana Be Detected via Drug Testing?

Some THC metabolites have an elimination half-life of 20 hours. However, some are stored in body fat and have an elimination half-life of 10 to 13 days. It takes five to six half-lives for a substance to be almost entirely eliminated. This is why you see advice that one-time use is probably not detectable after five to eight days.

How Long Does THC Stay In Your System

Table via

Most researchers agree that urine drug tests for marijuana can detect the THC in the body for up to 30 days (for everyday smokers).

However, there is anecdotal evidence that the length of time that marijuana remains in the body is affected by how often the person smokes, how much he smokes, and how long he has been smoking. Regular smokers have reported positive drug test results after 45 days since last use, and heavy smokers have reported positive tests 90 days (hair drug testing) after quitting.

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