The death penalty is under what may be an unprecedented review in the United States, mostly involving questions about lethal injection, by far the most common method of execution.
"Although many of the stays of executions are due to the lethal injection process, the openness of courts, of governors and legislators to reconsider issues that were thought to be settled is a sign of broad discomfort with the death penalty," said Richard Dieter, head of the Death Penalty Information Centre, which works against capital punishment.
About one-third of the 38 states that allow capital punishment have halted or delayed executions while legal and ethical challenges are resolved.
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"The breadth of the states halting executions and the number of issues being reviewed is unprecedented in the modern era of the death penalty," Dieter told Reuters.
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