Q. Can semen transmit drugs? If my boyfriend smokes marijuana and ejaculates inside of me could I fail a drug test?
A. Semen can carry certain drugs. For example, a woman who is allergic to penicillin may experience a reaction after intercourse if her partner is taking the drug.
It is possible that some compounds from marijuana could show up in your blood and urine, but they would probably be under the cutoff limits for a positive drug test.