Brain difference:Cause or effect?

• For genes to be contributed to criminal behaviour,they must be associated with a physical or psychological effect
• Many criminals have reported having a head injury
• Harmon


  in the general US population,8.5% have had a brain injury,while in US prisons its reported to be 60%
• Raises the possibility that brain injuries in criminals could be influenced by environmental factors rather than genetic factors,showing an issue with this explanation