n2's dilution sticky is all you need to pass a drug test

if you know when the test is, structure your dilution accordingly

if you're subject to random screenings, dilute yourself or obtain clean urine and keep it on your person whenever you go to work, in order to substitute. (various ways of raising temp)



all other potions, gimmicks and theories are hardly worth mentioning. n2's dilution sticky is pretty much all you need.