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What problems have been associated with lethal injections?

Problems include difficulty finding suitable veins, inadequate dosages of drugs, and untrained executioners. A survey of more than 1,000 executions by lethal injection in the United States found that more than 7 percent were botched due to one or more of the above factors. The most common reason for an execution by lethal injection to be halted was a failure by the executioners to establish an intravenous line.