i've heard that it worked.....at first i thought you were gonna ask if you drank bleach and visine if it worked lol....i know some people who claim that it works....they used to get piss tested for their job....i wouldn't rely on it unless you know it works tho....and only supposed to drop 1-2 drops in it.....and lightly shake the piss container (just kinda swish it arounD)