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http://wiki.answers.com/Q/Does_secondhand_marijuana_smoke_show_up_on_drug_test_the_next_day. If it's a hair drug test, secondhand pot smoke could be detected. The protocol for hair tests requires that when a test comes out positive, they take a second sample, wash it, then test both the washed sample and the wash water.
Also some tests (urine, blood, follicle, etc) can detect drug-use from different times in your past. Basically, negative means you dont have evidence of drug use in your system. just now. Report Abuse. A drug test is a technical analysis of a biological specimen-for example urine, hair, blood, sweat, or oral fluid / saliva-to determine the presence or absence of specified parent drugs or their metabolites. Negative drug test means that the person has no detectable drug in the test.