This is a 100% true story from my days as a town cop. I have now taken early retirement.
I had been the officer allocated to deal with a nasty domestic dispute in one of the villages on my patch.
The lady in question who I shall call Linda had suffered at the hands of her new boyfriend having recently divorced her husband. I carried out the investigations and completed the required paperwork and statements. I then went out and found the Boyfriend and arrested him.
This man was put before the court and the legal process commenced.
The man was given bail and was not allowed to go near the family home. It was my part of my duty to ensure the family were kept safe as the boyfriend had made threats towards Linda and her young son. The boyfriend then disappeared and we were unable to locate him and no court case ever took place.