Do urine drug screens only test for the metabolites of the drugs (after its processed by the body) or do they also test for the drug itself?

As a hypothetical situation lets say I dipped some resin into some water and then preformed a drug test on the water. Would it come pack positive for THC?
Typ0 Reviewed by Typ0 on . Unique Question, Metabolite vs Drug Do urine drug screens only test for the metabolites of the drugs (after its processed by the body) or do they also test for the drug itself? As a hypothetical situation lets say I dipped some resin into some water and then preformed a drug test on the water. Would it come pack positive for THC? Rating: 5