(2a) For example, Osborne and West found that where the father had a criminal conviction, 40% of sons also acquired one by 18 compared to 13% of sons with non-criminal fathers. However, Mattheus also found that juvenile delinquents were more likely than non-delinquents to report having friends who engage in criminal activity. This shows that because it applies to peer, it's about learning not just genes. However, it's unclear why why some people who were raised in persistent contact to eith 'criminogenic influences don't commit offences. SLT therefore cannot be a complete explanation.