There are many people who respond to abuse victims who cooperate with law enforcement to prosecute their abusers by telling them that according to Matthew 18:15-17 they are doing wrong. This is the passage that talks about if you have a problem with a brother you go to them, if they don't listen then you bring someone with you, then if they still don't listen you bring it to the church. Let me emphatically say this does NOT apply to crimes! I have never heard this used with someone who commits a murder, so why on earth should it apply to any other crime????? When a crime is committed the authorities MUST be contacted, that is the law!
Physical abuse, rape, incest, sexual abuse of any kind, and frankly ANY kind of abuse is a CRIME and should be dealt with as such. If you want a passage that applies to how to deal with crimes Romans 13:1-7 would be much more applicable. God has ordained our governmental authorities, and if you do no wrong you don't have to fear, but if you break the law you do. Prosecuting a crime is completely Biblical! There are consequences (both good and bad) for the actions that we choose. When a crime is committed we should allow the authorities that God has ordained to deal with the investigation and allow the perpetrator to pay the price for their actions.