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Let's look at poisons in order of increasing stealth: Cyanide, a chemical poison, death occurs when 1g is consumed in 1-2 minutes, when 150mg is consumed in 5-6 hours, ideal for suicide, because 100% of it will be found on forensic medical examination it is EXTREMELY not recommended for murder, besides effective the antidote is alcohol and sugar, which decompose it in the stomach.