This question has also been asked and answered here: How long does klonopin stay in your system?
3 May 2010
That depends on how much you were taking and for how long... but the actual half-life of Klonopin/Clonazepam is 35 hours (varies with physiology/metabolic rate)... which means that the amount of Klonopin in your sytem will divide in half every 35 hours, assuming you don't take more. Example: 1mg after 35 hours equals 0.5mg still in your system, after another 35 hours 0.25mg still in your system, etc. etc. If you are asking whether or not it will register on a drug test after a certain amount of time, that depends greatly on the type of test, and the threshold detection level of that particular test... Most basic UAs don't even look for benzos.
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