I just took a pre-employment drug test and prescribed Klonopin 0.5mg PRN. After reading around, it seems these drug tests will detect 200ng/mL. If I took 0.5mg of Klonopin once per day for 3 out of 5 days leading up to my drug test, will that be detected in the 200ng/mL? What does 200ng/mL equal? I m 5 7 , 130lbs, fast metabolism. I know this should be a non-issue since it s prescribed, but I didn t think to mention it for the drug test and will not be excited to have to explain it if they even give me the chance.