^ Awash with double negatives!
I've extracted amphetamine from my own urine before, but it wasn't a case o desparation, but curiosity. I did once put forward the idea that you could use your body to produce narcotics - swallow 300mg of codeine with a cyp3A4 inhibitor (couple of glasses of grapfruit juice will do) to prevent metabolism to norcodeine or normorphine, then wait until you piss out morphine-6-glucuronide. Extract it and hydrolyse the morphine-6-glucuronide by heating it with dilute hydrochloric acid and voila about 150-200mg of morphine hydrochloride in soln
Of course to do it on a large scale involves getting a lot of people to piss into a big tank... at that point I'm no longer interested; my own piss is fine, but other peoples (and the foods they've eaten that alter the smell). No thanks