Biological theories ignore environmental factors , seen particularly ion XYY where focus is genes . Weakness as a persons biology can cause traits like aggression but the environment triggers it to turn into a criminal act .
biological theories don’t always use samples representative of all criminals , study convicted criminals - not ones that got away with crime - weakness as it’s not a sound basis for generalising to all criminals and research may lack validity
gender bias , focus on males , doesn't explain female criminality
