Christa Pike's survival of two lethal injection attempts has triggered nationwide scrutiny of state execution protocols. Execution methods differ across states, with lethal injection, electrocution, lethal gas, and firing squads being authorized. Lethal injection is the predominant method, comprising approximately 89% of executions since 1976. Many states list lethal injection as their primary execution method. Lethal gas is an option in nine states, while electrocution is permitted in nine states. Firing squads are allowed in five states, and it is the primary method in Idaho. Some states offer prisoners a choice of execution methods. The Supreme Court mandates that the death penalty be reserved for the most severe murders. Pike, convicted of murder, survived two lethal injection doses in Tennessee. As of Friday, she remained alive and unconscious on a ventilator.