Doc, if someone used cocaine or molly's and took some pills that makes you pee to much. and used the thing they put in the hospital the water thing. and has a drug test the next day. would it show. ?

Most likely: The drugs or their metabolite would still show depending on the half life of the drugs

Some of the newer : urine screens include MDMA. Even if they don't, Molly will show up as amphetamine & methamphetamine up to 3 days after single use & up to 5 days after heavy use. A cocaine metabolite, benzoylecgonine, persists in urine up to 4 days after a single hit. Chronic, heavy use of cocaine can result in detectable amounts for up to 10 days after a binge. Might as well 'fess up. I think you're busted.