Arizona PBS July 13, 2021 Arizona has carried out most executions with lethal injection since 1992, although some death-row inmates have the choice of that or the gas chamber. The state last executed a man in 2014, when the drugs that were injected into the inmate took almost two hours to kill him. (Photo courtesy Arizona Department of Corrections, Rehabilitation and Reentry) WASHINGTON – The state’s plan to execute two death-row inmates as early as this fall were derailed Monday when the Arizona Supreme Court ordered the state to first determine the viability of its execution drugs before pressing ahead. The order came after the state acknowledged that the pentobarbital it planned to use in the executions would only be good for 45 days, not the 90 originally claimed – and after Attorney General Mark Brnovich asked the court to cut the briefing schedule in half to account for that error.