A single use of Heroin, along with other opiates, will generally last in your "system" for 1-4 days. Three days is usually the average duration, but it depends on the amount taken. This means Heroin will cause you to be positive for opiates in a urine test for 1-4 days, but after 24 hours it will be indistinguishable from other opiates, meaning you can claim you took Hydrocodone or another painkiller if you test positive a few days after you ingested the Heroin. However, traces of Heroin can be found in your hair for months.
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Two weeks max.. If ur a daiky user. If u only used once.. Bout three days or four day
Blood: Up to six hours
Urine: Up to three days
Saliva: Up to 24 hours
Hair: Up to 90 days