well, here's my experience. I took a little over 50 2mg clonopin tabs leading up to a Texas parole drug test. I took my last tablet about 12-16 hours before I peed. I've read over and over that clonopin metabolizes differently than other benzos so it often won't show. But I've also read lots of claims of people saying that just isn't true. Well, I took what I'd consider a large amount of clonopin leading directly to the parole piss test and...I was clean for benzo. That's just my presonal experience, so take it for what it's worth.