Many reasons: Depends on several factors - what test are they using? Tests for benzodiazepines usually detect oxazepam, which is a primary metabolite of most of them (the ones where it isn't - xanax (alprazolam) and klonopin). There are test kits that will reliably detect Klonopin and xanax (alprazolam), but these are not always used. In addition, if you drink a lot of water, you may dilute your urine down to a negative level.
Answered 4/13/2016
4.5k views
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question