the libraries at erowid.org/psychoactives/testing/testing.shtml have tons of useful information about drug tests. Off-Hand, amoxocillin has been known to trigger tests for
cocaine, and DXM (an OTC decongestant commonly found in cough meds) can trigger tests for opiates, as can codiene-containing cough syrups,
demerol and poppy seeds. depending on the test,
oxycodone,
hydrocodone and hydromorphone may trigger tests for opiates as well, but would be distinct from heroin.
Information = Freedom