EVIDENCE LIBRARY
Browse source-supported forensic toxicology guides in this subject area.
Oct 20, 2026
In 24 analyzable MRS volunteers, 20 mg dextroamphetamine changed dACC glutamate, Glx and creatine; methamphetamine had no overall MRS effect. No whole-blood drug levels were tested.
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A 45-surface cocaine-screening survey found 35 DrugWipe positives. Learn why unconfirmed environmental immunoassays do not prove ingestion, transfer or blood cocaine.
Read guideOct 20, 2026
Primary five-monkey study: evening 0.56 mg/kg methamphetamine changed actigraphy sleep and next-day task errors; lower dose sleep tests and omissions were nonsignificant. Not human blood evidence.
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An original 55-person N-back analysis found 20 mg d-amphetamine reduced post-error reaction time without significantly improving accuracy or measuring blood drug levels.
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A 65-adult study found more missed or mistimed future intentions with methamphetamine-dependence history, but recognition, delayed call and cue interaction were null.
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A primary cocaine hair-contamination study found measurable drug after shampooing but negative combined wash criteria. See the method, numeric hair results and limits.
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Primary 2026 fMRI study: 82 methamphetamine patients, r=0.33 prediction of craving improvement, only 60% binary accuracy, marked sex imbalance; no blood assay or verified relapse.
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Physical neglect and positive methamphetamine urine screens in 115 outpatients: what WCST results, study attrition and adjusted null findings actually establish.
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An original 100-adult study found group cognitive differences but no reliable link between self-reported methamphetamine amounts and individual impairment.
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An 89-person primary study found greater aversive pruning in methamphetamine use disorder but null general planning and reward sensitivity differences. No blood-drug test or DUI inference.
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