I agree there's a lot of abusers in the police. The 40% is an unreliable study, it's old and counts really low level things like slamming doors as domestic abuse. Big issue is not considering the pattern of behaviour and coercive control. For example she finds out he's cheated and slaps him in a one off assault... illegal, but ongoing coercive control isn't there. DA perps in the police needs more research really, which hopefully will happen.