Cocaine Not often used in murder. An overdose overstimulates the eart fatally. Colchicine Pale yellow crystals from meadow saffron. Kills in small doses. Fatal within 7 to 36 hours.
Death is by paralysis of repiratory system.
Coniine Oily liquid from hemlock. Not painful to die from it, but progressively paralyses the body until in the end heart or lungs fail. No post-mortem signs except of asphyxia. Gelsemium Seldom used. Symptoms are muscular weakness with slow pulse, dilated pupils.