In a suspected case of death due to which of the following poison cadaveric rigidity lasts longer than usual?
Postmoem rigidity is prolonged in arsenic poisoning. Convulsions prior to death can cause prolongation of rigor mois, arsenic poison is found to cause convulsions resulting in prolongation of rigor mois. Ref: Forensic Medicine and Toxicology By John Dixon Mann, Page 453
Lead
Arsenic
Mercury
Copper