This afternoon, Arkansas Governor Asa Hutchinson said he would not call for an investigation into lethal injection procedures, despite yesterday's execution when the prisoner convulsed for several minutes, according to eye witnesses. (Why Arkansas rushed several executions this week, here.)
Despite recent botched executions and problems getting the drugs, lethal injection is the primary means of execution in the 31 states that impose the death penalty. However, several states offer alternative methods of execution. Here they are in order of popularity, according to the Death Penalty Information Center.