In accordance with Massachusetts law, police submitted all alleged contraband for chemical testing.
Professor Patrice Mangin is a widely published forensic pathologist and toxicologist, director of the University Center of Legal Medicine in Lausanne and Geneva, Switzerland.
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Although the Marsh test was efficacious, its first publicly documented use—in fact, the first time evidence from forensic toxicology was ever introduced—was in Tulle, France in 1840 with the celebrated LaFarge poisoning case.