an explanation for criminal behaviour, suggesting that certain individuals are born with a criminal personality, and this innate personality is a throwback to earlier primate forms
such individuals are distinguishable by facial and other physiological features
characteristics of criminals- strong prominent jaw, high cheekbones, dark skins, extra toes, nipples or fingers
characteristics of murderers- bloodshot eyes, curly hair and long ears
characteristics of sexual deviants- glinting eyes, swollen and fleshy lips
characteristics of fraudsters- thin and reedy lips
other non-physical traits- unemployment, tattoos and use of criminal slang, insensitivity to pain