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According to Wikipedia this is actually already ongoing since 2006.

I will second this too but in my case it was from a source in the military. The fact that they had a long career and used it to pass UAs repeatedly made me believe there may be some truth to it.

What the heck? No way that works is my fist assumption but guess can see how folks would try it.

It doesn't work.

My guess on why it spreads is the fact that false negatives are pretty common with cannabis tests, so someone that tried this method passed a test they shouldn't have and they attribute this to the bleach.