This document discusses arguments for and against the death penalty. It notes that the death penalty has never been shown to deter crime and that innocent people have been sentenced to death. While some methods of execution like lethal injection are used in some states, other countries use hanging, electrocution, firing squad, gas suffocation or beheading. Internationally, some countries and human rights groups are urging the abolition of capital punishment, though some U.S. states still practice it for retribution despite the concerns about deterrence and the possibility of wrongful convictions.