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Fentanyl HCl is of particular interest in forensic cases but there is a notable gap in literature regarding its analysis. This study utilized a multi‐method approach to characterize fentanyl HCl powder, both fresh and following a forced degradation process. Using sensitive liquid chromatography–tandem mass spectrometry (LC–MS/MS) and direct injection gas chromatography–mass spectrometry (GC–MS), five...