False Positives For Benzodiazephine

my son has been in a drug court program for the past year and a half he is drug tested weekly and the entire time has not had any positive drug screen. he has 8 weeks left to program and tested positive for benzodiazephine. The only thing different is he has not been taking his prescription meds for his asthma and has taken walgreens brand bronchial asthma relief tablets to help his breathing. this medicine has ephedrine hci 12.5mg and guaifenesin 200 mg. could this cause a false positive

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No, neither the Ephedrine, nor the Guaifenesin have been known to cause false positives for Benzodiazepines.

Learn more Benzodiazepine details here.

Was he taking anything else, including other over the counter products?

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yes antihistamine for allergies and advair inhaler

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