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and dishes are named after famous inmates, but back then it was a tough facility with a brutal reputation. Like Elliott, Bob believed that the psychopaths in his care buried their madness beneath a façade of normality. But Bob was less idealistic. He was interested in detection, not cure. He’d been tricked so many times by devious psychopaths. On his very first day working at the prison, for example, the warden had told him he needed a uniform and he should give his measurements to the inmate who was the prison tailor. So Bob did, and was glad to observe how assiduously the man took them. He spent a long time getting everything just right: the feet, the inside leg. Bob felt moved by the sight. Even in this awful prison, here was a man who took pride in his work.
    But then, when the uniform arrived, Bob found that one trouser leg rode up to his calf while the other trailed along the ground. The jacket sleeves were equally askew. It couldn’t have been human error. The man was obviously trying to make him look like a clown.
    At every turn, psychopaths were making his life unpleasant. One even cut the brake cables of his car while it was in the prison’s auto repair shop. Bob could have been killed. And so he started devising tests to determine if psychopaths could somehow be rooted out.
    He put word around the prison that he was looking for psychopathic and non-psychopathic volunteers. There was no shortage. Prisoners were always looking to relieve the boredom. He strapped them up, one by one, to various EEG and sweat and blood-pressure measuring machines, and also to an electricity generator, and he explained to them that he was going to count backward from ten and when he reached one, they’d receive a very painful electric shock.
    The difference in the responses stunned Bob. The non-psychopathic volunteers (theirs were crimes of passion, usually, or crimes born from terrible poverty or abuse) steeled themselves ruefully, as if a painful electric shock was just the penance they deserved, and as the countdown continued, the monitors revealed dramatic increases in their perspiration rates. They were, Bob noted and documented, scared.
    “And what happened when you got to one?” I asked.
    “I gave them an electric shock,” Bob said. He smiled. “We used really painful electric shocks,” he said.
    “And the psychopaths?” I asked.
    “They didn’t break a sweat,” said Bob. “Nothing.”
    I looked at him.
    “Sure,” he added, “at the exact moment the unpleasant thing occurred . . .”
    “The electric shock?” I asked.
    “Yeah,” said Bob. “When the unpleasant thing occurred, the psychopaths gave a response . . .”
    “Like a shriek?” I asked.
    “Yes, I suppose like a shriek,” said Bob. But the tests seemed to indicate that the amygdala, the part of the brain that should have anticipated the unpleasantness and sent the requisite signals of fear over to the central nervous system, wasn’t functioning as it should.
    It was an enormous breakthrough for Bob, his first clue that the brains of psychopaths were different from regular brains. But he was even more astonished when he repeated the test. This time the psychopaths knew exactly how much pain they’d be in when he reached one, and still: nothing. No sweat. Bob learned something that Elliott Barker wouldn’t for years: psychopaths were likely to re-offend.
    “They had no memory of the pain of the electric shock even when the pain had occurred just moments before,” Bob said. “So what’s the point in threatening them with imprisonment if they break the terms of their parole? The threat has no meaning for them.”
    He did another experiment, the Startle Reflex Test, in which psychopaths and non-psychopaths were invited to look at grotesque images, like crime-scene photographs of blown-apart faces, and then when they least expected it, Bob would let off an incredibly loud noise in their ear. The non-psychopaths would leap with