Piss test came back positive for smoking weed

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Q: Can you explain the reason for a false-positive urine drug screen for marijuana? A: In , an estimated UDS is an immunoassay test that uses antibodies to detect presence of specific drugs or metabolites. It is the most common method for initial screening. Advantages of the immunoassay test include the capability for large-scale screening and rapid detection, but the disadvantage is the potential for false-positive results.
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Effects of Secondhand Smoke on Marijuana Drug Tests

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Study Finds Positive Drug Test from Secondhand Marijuana Smoke Unlikely | Dominion Diagnostics

People often ask about the possible psychoactive effect of exposure to secondhand marijuana smoke and whether a person who has inhaled secondhand marijuana smoke could fail a drug test. Researchers measured the amount of THC in the blood of people who do not smoke marijuana and had spent 3 hours in a well-ventilated space with people casually smoking marijuana; THC was present in the blood of the nonsmoking participants, but the amount was well below the level needed to fail a drug test. Another study that varied the levels of ventilation and the potency of the marijuana found that some nonsmoking participants exposed for an hour to high-THC marijuana The known health risks of secondhand exposure to cigarette smoke—to the heart or lungs, for instance—raise questions about whether secondhand exposure to marijuana smoke poses similar health risks. At this point, very little research on this question has been conducted.
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How long can you detect marijuana in the body?

A new study finds it is unlikely that a person exposed to secondhand marijuana smoke will test positive for marijuana themselves. While it is possible that extreme marijuana smoke exposure could produce a positive urine test, this occurrence is likely to be rare and limited to the hours immediately after exposure, according to researchers from Johns Hopkins University. Six non-smokers were seated next to the smokers. In two sessions, the participants were in a room with no ventilation, while in the third session they were in a ventilated room. Urine levels of THC surpassed typically detectable levels in only one participant, four to six hours after exposure.
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We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. The length of time this chemical stays in the body or continues to show in a drug test depends on many factors. These include:.
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