In the past, criminal behavior was considered to be mostly due to the genes of the individual. Certain physiological traits are considered to be related to criminal acts. The son of a criminal was also predicted to be one. There was a stigma attached to these people, who could never be eliminated, even if the person was himself a good citizen. This all changed when some recent experiments revealed the existence of environmental factors has a strong influence on individual behavior. An individual who had certain traits appear ...