Armarjeet Sada was the world's youngest serial killer

ASPD is a psychological condition which is associated with manipulation, aggression and a general disregard for rules and other people. Symptoms develop in a person’s late teens and improve by the time the individual reaches their early 40s, suggesting that even though there is a strong biological component, effective therapies may be related to the ‘nurture’ side of the nature-nurture debate.