Amphetamines (AMPs) in hair were investigated with thousands of workplace testing head and body hair samples collected and analyzed over 10 years and tabulated by year. All samples were washed by a published extensive method prior to confirmation by liquid chromatography-mass spectrometry-mass spectrometry. Presented are concentrations of parent methamphetamine (METH), 3,4-methylenedioxymethamphetamine (MDMA) and methylenedioxyamphetamine as metabolite and AMP as metabolite and without the presence of parent drug. Some differences in METH concentrations from year to year were significant, and some ratios of metabolite to parent drug for both METH and MDMA also varied significantly. While rates of METH use may not have changed significantly, some aspects of the drugs ingested as demonstrated by hair analysis varied over the 10-year period.
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