The answer is no. No it doesn't cleanse your system of THC. You friends have been the victims of drug-testing folklore. Cranberry juice is not even a diuretic. It's just an acidic juice that acidifies urine and thus is mildly helpful in fighting bacterial urinary tract infections.

The fact that your friend passed his drug test was either a lucky coincidence (it takes a while for the cannabis metabolites to get to detectable levels) or else he'd simply not used enough that he tested positive at that time.
birdgirl73 Reviewed by birdgirl73 on . Cranberry juice. Does it really cleanse your system of THC? my friends are all really stupid in general. one of them said we should go smoke some weed and bring a ton of cranberry juice. and when i asked why cranberry juice he said so it rids your system of thc. so we smoked he drank a carton of cranberry juice and had a drug test 2 days later, he passed. luck? myth? or fact? Rating: 5