Does heroine show up in a drug screen?

Depends on how much and often you used , how you used (if you smoked is generally detectable for longer by any type of fluid drug test), lab cutoffs and type of metabolites they looking for (heroin breaks down into codeine, morphine and 6-acetyl-morphine, codeine breaks down into morphine. ) ... approx from 1-3 days to max 6-8 days.