Anyone could hang a man, and quite a few people could pull a lever that released cyanide into an airtight room. A fewer number could probably electrocute a human; that was a job frequently botched. The half-burned corpse still twitching, requiring another thirty-second jolt of fourteen hundred volts, the lights dim again in the prison library… But hardly anyone outside the medical profession could be found qualified to measure a lethal dose of poison and neatly prepare a man for the injection of it.