This is Dr. David
no, making out with someone who has used marijuana would not give you enough marijuana in your system to cause your urine to be positive for THC if you don't use marijuana.
but marijuana smoking can contaminate your hair and cause false positive for hair follicle testing.
every urine screening positive test has to be confirmed with a MS/GC mass spectroscopy/ gas chromatography test for confirmation
if you don't use marijuana, your confirmatory test will come back negative
let me know if you have other questions.
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