In just one death penalty trial "the state may pay one million dollars more than for a non-death penalty trial. But only one in every three capital trials may result in a death sentence, so the true cost of that death sentence is three million dollars," the study's author said.

"Further down the road, only one in ten of the death sentences handed down may result in an execution. Hence, the cost to the state to reach that one execution is 30 million dollars," Dieter added in the report entitled "Smart on Crime."

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