EVIDENCE LIBRARY
Browse source-supported forensic toxicology guides in this subject area.
Oct 20, 2026
A 73-person placebo-controlled oral methamphetamine study found faster monetary-cue reactions in women but not men. No measured blood level or driving impairment was established.
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In 20 adults, oral d-methamphetamine did not significantly change overall simulator errors; one emergency-speed contrast was nominal. Blood vs saliva evidence and DUI limits.
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A controlled 25-man trial measured CBD in plasma after 30 and 700 mg. Most cortical excitability and psychomotor outcomes were nonsignificant.
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A seven-calf primary study measured plasma CBD after one 5 mg/kg oral oil dose. Examine peak, 23-hour estimated half-life, variability, and why meat or milk withdrawal remains untested.
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A controlled 24-person study found amphetamine drugs improved vigilance and go accuracy, not stop-signal inhibition. Plasma amphetamine is not an impairment cutoff.
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A primary 18-person, 42-sample pilot detected breath-aerosol THC in 80% after cannabis use but also at baseline. Why no individual recent-use or impairment cutoff follows.
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A 128-person randomized THC-placebo crossover study found disrupted prefrontal fNIRS connectivity, but did not validate a roadside impairment test or measure blood THC.
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Direct THC/CBD/CBN vapor-pressure measurements and modeled breath aerosol fractions show why particle-only THC breath capture needs validation—not proof of impairment.
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A 60-person monitored-abstinence study found urine THC screening can turn positive after negative. Learn why THC-COOH, creatinine, and cutoffs matter.
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Can a 30-µL finger-prick test measure CBD? Five Dravet patients, capillary-versus-venous results, assay limits and why p = 0.69 is not equivalence.
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