what can I do!!

[Ground hawg]

Ok, Long story but heres the short version. My girlfriend has a daughter thats Just turned 17 about a month ago. We just found out that she's been having sexual relationship with a 39 yr olg guy. the law in Ohio counts this as consensual as she was past her 16th birthday. this Fu** has had her doing some real sick **** that can only be described as abuse. he has a rap sheet longer than the local phone book. how can I find out everything about this prick and stop him from hurting someone else.

I realy need help with this guy