Violet light significantly increases bruise detection across skin tones, researchers say In an NIJ-funded randomized longitudinal study presented by George Mason and Texas A&M researchers, alternate light at ~415 nm and 450 nm (with yellow/orange filters) substantially increased bruises detected versus white light and produced clinically meaningful visibility gains; authors urged standardized guidelines before routine clinical rollout.

Researchers have discovered that specific wavelengths of violet light can boost bruise detection rates by up to five times compared to regular white light, revolutionizing clinical and forensic practices.

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State labs refine methods to distinguish hemp from marijuana after 2018 Farm Bill At an RTI webinar, Virginia and Colorado forensic lab leaders described how the 2018 Farm Bill and evolving USDA guidance prompted new testing approaches: Virginia validated field kits and set administrative screening thresholds; Colorado adopted semi‑quantitative GCMS/FID schemes and HPLC quantitation for plant material.

State forensic labs are revolutionizing their testing methods to clearly distinguish between hemp and marijuana, reshaping legal landscapes after the 2018 Farm Bill.

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DEA outlines new forensic scheme: color test plus rapid GC‑MS for THC decision limits The DEA Special Testing and Research Laboratory described a validated two‑part forensic approach — a typification (4‑aminophenol) color test and a rapid GC‑MS decision limit tied to an internal standard — and set reporting rules for 'marijuana' versus 'inconclusive.'

The DEA has revamped its forensic testing methods to precisely differentiate between hemp and marijuana, shedding light on the complexities of cannabis identification in law enforcement.

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