Up to 5 days: It is a very long-acting and very slowly metabolized drug, and its metabolites (norbuprenorphine) stay even longer if they are being looked for. Most drug screens do not test for it, and there are special kits that do. Confrimatory tests (GC/MS, LC/MS/MS) should detect it in any case, and depending on where they set their sensitivity (like 50 ng/ml) can detect it for 7-10 days.
Answered 8/16/2016
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