: Psychopaths are often charismatic, quick-witted, and engaging, which can mislead even experts. Kiehl advises paying attention to that subtle "gut feeling" when something feels off.

: While they make up less than 1% of the population, psychopaths are responsible for a disproportionate amount of violent crime.

'The Psychopath Whisperer' by Kent A. Kiehl - The Boston Globe