Maybe try this?

"The strangest and most remarkable feature of the fly-agaric is its effect on the urine. The Koryaks have known since time immemorial that the urine of a person who has consumed fly-agaric has a stronger narcotic and intoxicating power than the fly-agaric itself and that this effect persists for a long time after consumption. For example, a man may become moderately drunk on fly-agarics today and by tomorrow may have completely slept off this moderate intoxication and be completely sober; but if he now drinks a cup of his own urine, he will become far more intoxicated than he was from the mushrooms the day before... . (Langsdorf, quoted in Wasson, 1968:249).x