Unique Question, Metabolite vs Drug

[Typ0]

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]

Follow up question, what if I dropped some resin chunks in there and let them sit. Would it test positive for THC then?

[Burnt Toast]

Doesnt work that way. ALL urine drug testing devices recognize drug metabolites and not the drug itself. THC has to be ingested and metabolized in order to be detected on a U/A.