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It depends on the type and sensitivity of the test. Basic test will test for opiates, which will come back positive by using for morphine, codeine or heroin. The basic test will not differentiate between the three it will simply be positive for "opiates."

Codeine and Heroin for that matter are prodrugs meaning they have little or no pharmacological actions alone instead, they are broken down into morphine which is what actually provides the analgesia. More advanced tests can differentiate morphine and codeine because there will still be some codeine molecules and there will be morphine. If morphine were used then only morphine would show and Heroin has two other active metabolites 6-MAM and 3-MAM and if those metabolites are present it would mean heroin was used. Also note that Heroin is NOT an opiate, it only shows up because it turns into morphine which, along with codeine, is an opiate.

Also blood tests are the most accurate however they are the most expensive and they can only detect a drug for a few hours.

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15y ago

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