THC metabolism: Single use of marijuana should be out of 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. Marijuana regular use detected in hair for months. Single use might not be picked up in hair. 2nd hand smoke not likely to have sign. impact.
Answered 5/4/2015
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