 Over recent years and presumably due to the fact that he was left gravely injured after being shot, Horatio has become more aggressive than usual when it comes to dealing with suspects and he has been seen on at least two occasions apparently assaulting a suspect in a locked room (the actual assault is only implied as it takes place off camera).In both these cases the suspect was accused of abuse (one child molestation, the other domestic violence).Further evidence of this can be found in the season 8 episode "Kill Clause", the ending of which implies that Horatio has sanctioned the murder of a corrupt CEO who had his employees murdered for their life insurance.