A member asked:

How long can weed stay in your system if you only smoked once?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Detection: Single use of marijuana should be out of your urine in 1 to 7 days. Single use marijuana can be detected 12 to 24 hours in blood. Single use might not be picked up in hair.

Answered 2/11/2019

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