Ville ikke satses på at "certo-metoden" fungerer da det bare er en "stonermyte" som alt annet.
Du vil også få akkurat samme effekt av å spise mye fiber som med certo.

There is a common assumption among stoners who use this fruit pectin based method that the pectin coats the insides of your stomach and more importantly urine bladder, blocking THC or other toxins from entering your urine temporarily.

There’s very little, if any, evidence behind this however and I’m not entirely sure where this claim originated.

http://thcclean.net/certo-drug-test-method/