Postmortem changes include unclotted blood from septicaemia, CO poisoning, or large doses of anticoagulants. The body is exhumed only with a written order from authorities. Signs of death include immediate, early, and late changes such as suspended animation, cooling of the body, postmortem hypostasis, muscular changes from relaxation to rigor mortis to secondary flaccidity, and decomposition through autolysis and putrefaction.