Can You Fail a Drug Test Because of Second Hand Smoke?

Most likely, you cannot fail the drug test because of second hand smoke, for most drug tests set high standards to avoid get false positive results due to being exposed to second hand smoke. The chemical tetrahydrocannabinol (THC) can be traced in the urine for a day due to second hand smoke, but the amount of THC is usually not high enough to make the result positive.

However, if the smoke is so dense that irritates your eyes, the result of THC can be positive.