Hmmm
Snopes would seem to agree with you. Myth.

Reason I'd always assumed this was true was that at the height of my fuckheadedness I got a load of drug testing kits (the type you wee on) from a nurse friend so that I could test myself the day after indulging. They'd always show a strong reading for amphetamines, and quite often a strong reading for opiates too (and a load of other stuff as well - barbiturates etc - quite frightening really the mix of stuff you're exposed to from having consumed what you think is one type of drug). Obviously though a sample group of one is not exactly scientific.
( rofl harris, Thu 23 Sep 2010, 10:49, Reply)