It’s estimated that nearly 100 million Americans have used marijuana, and 14 million do so on a regular basis. While you may not be one of them, a friend, family member or significant other may be. If this is the case and you are scheduled to take a drug test for a job, you may be worried about whether or not you will pass. People in this scenario often ask, ‘can you test positive for marijuana from second hand smoke?’ Can You Test Positive for Marijuana from Second Hand Smoke? In the U.S. 90% of drug tests are urinalysis tests. This means that a urine sample is tested to detect drug metabolites. In the instance of marijuana the metabolite is tetrahydrocannabinol, more commonly referred to as THC. If a subject has 50 nanograms per milliliter (ng/ml) or more of THC in their sample, then they will be considered positive for use. Tests verified that even after significant, long exposure to second hand marijuana smoke, a person is highly unlikely to reach 50ng/ml, therefore it w...