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second hand exposure to marijuana?
Okay then that is why you tested positive
how can I help?
In adolescents and adults, it is difficult to achieve sufficient concentrations from secondhand smoke from typical cannabis cigarettes to detect metabolite concentrations above most urine drug screen limits. However, studies using products with higher THC content (typical of what is more commonly used since 2005) have not been performed. Also, the potential for second-hand cannabis exposure to cause a positive screen in children has not been studied.
It could be possible.