Depends. Depending on the amount of exposure (and the sensitivity of the testing, assuming you are talking about drug screen testing, ) it can be present for 1-3 weeks after exposure.
Marijuana. Small amounts and irregular use, with a urine screening cutoff of 50 mcg should be 1-2 days. Regular use is up to 3-5 days, and excessive use can lead to a positive drug tests for weeks. We have all heard of heavy use for years with a positive drug test months after stopping, but this would be extremely rare.
THC. Single use of marijuana should be out of your urine in 1 to 7 days. Regular use of marijuana – should be out of urine in 7 to 100 days. Single use marijuana can be detected 12 to 24 hours in blood. Regular use marijuana can be detected for 2 to 7 days in blood. You really can't rush it along. Read more...