Bundy
© Donn Dughi/Bettmann/CORBISTed Bundy, shown here in 1978, unwittingly had a role in sparking Kent Kiehl’s interest in psychopaths
Kent Kiehl was walking briskly towards the airport exit, eager to get home, when a security guard grabbed his arm. "Would you please come with me, sir?" he said. Kiehl complied, and he did his best to stay calm while security officers searched his belongings. Then, they asked him if there was anything he wanted to confess.

Kiehl is a neuroscientist at the Mind Research Network and the University of New Mexico in Albuquerque, and he's devoted his career to studying what's different about the brains of psychopaths - people whose lack of compassion, empathy, and remorse has a tendency to get them into trouble with the law. On the plane, Kiehl had been typing up notes from an interview he'd done with a psychopath in Illinois who'd been convicted of murdering two women and raping and killing a 10-year old girl. The woman sitting next to him thought he was typing out a confession.

Kiehl recounts the story in a new book about his research, The Psychopath Whisperer. He has been interviewing psychopaths for more than 20 years, and the book is filled with stories of these colorful (and occasionally off-color) encounters. (Actually,The Psychopath Listener would have been a more accurate, if less grabby title.) More recently he's acquired a mobile MRI scanner and permission to scan the brains of New Mexico state prison inmates. So far he's scanned about 3,000 violent offenders, including 500 psychopaths.

He talked with WIRED about what's different in the brains of psychopaths and why he views psychopathy as a preventable mental disorder.

You can read the interview here.