It was unlikely that any contact high was passed during this study. While a trace amount of THC did show up in their blood and urine, it wasn’t enough to trigger a positive drug test result.

Rather than stick nonsmokers in a closed, unventilated room for long smoking sessions, these study participants spent three hours in a coffee shop where other patrons were smoking marijuana cigarettes.Īfter their exposure to secondhand marijuana smoke, participants were tested for THC. However, ventilation during marijuana exposure, as well as how often exposure occurred, were critical factors in what the drug test result would be.įor example, smelling marijuana smoke in passing once in a while is a lot different from living with a habitual marijuana smoker who uses marijuana in your presence regularly.Īnother small study attempted to mimic a more true-to-life example. In 2015, a small study of six smokers and six nonsmokers showed that marijuana smoked in highly concentrated quantities could trigger a positive urine drug test among people who were simply exposed to the smoke in an unventilated room.

Drug test results can differ for people who are exposed to secondhand marijuana smoke and people who smoked marijuana.

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