Antisocial Personality Disorder (ASPD) is wildly overrepresented in prisons. Take a crowd of 100 people of the street, and chances are just one to three of them will have ASPD. Take 100 people from a prison, and you can expect 40 to 70 of them to have the disorder.
That’s significant, because ASPD has been linked with aggression, irritability, disregard for rules, disregard for other people, and dishonesty.
It’s a controversial diagnosis — broad, ill-defined, and overlapping heavily with other disorders like psychopathy.
But there’s reason to take it seriously. Twin studies suggest that genetics explain about half of the variance in ASPD diagnoses, and environmental factors the other half.