Psychological theory - Eysenck's personality theory 1963.
Those who score high in ENP - extroversion, neuroticism, and psychoticism. more likely to become criminals.
Extroverts - thrill seekers, take risks which could be criminally driven
Neurotics - Anxious, easily persuaded into crime than others.
Psychotics - egocentric, aggressive and unsympathetic towards victims of crime.
high scores of E + N less likely to be responsive to conditioning. punishments wont be effective.