My friend had been using heroin IV Wednesday and Thursday, maybe 8 stamp bags each day of okay H. He is 27 years old 190 pound and in good health. If he stopped using at 5am friday morning, would he pass a lab UA the following tuesday evening? Making it almost 4 1/2 days since he used.
Time detection for urine test analysis for heroin depend on the method use and sensibility of the test. Normal detection times are 3-5 days so is probable (but not sure) that he will test negative. Drinking a lot of water, sweating, doing exercise or using diuretic are useless methods to eliminate heroin from urine.