I carried a flat slapper for years. Seldom used, but very useful.
One time we were at a domestic where the husband was an AH First Class. He had battered his wife, but she refused to press charges. At the time, the DA would not prosecute if we had a disinterested prosecutrix.
The wife wanted to leave. Despite two vehicles in the driveway, the husband would not turn over the keys to either one. We had her pack up a few belongings so we could transport her for a medical checkup, then to a battered women's shelter.
We were leaving with her, going down a narrow stairway with concrete sides that led to the driveway. I deliberately was last in line thinking the husband would make a move towards her, which would have to be through me. That battery on a peace officer would make him arrestable, and then we could add on the domestic violence charge, and then maybe the DA would file.
The husband made his move as we were on the staircase. As he started to push me aside, I already had the slapper in my hand. So as I was being moved I came around and gave him 2 or 3 very quick blows to the head.
Fight was over instantly. Took him to the county hospital to get his head stitched up, then to jail. As I was also the command duty officer, I called the on-call judge to get the bail raised to where he would not get out until he want to court. Judges were extremely cooperative on such matters.
As soon as he appeared in court he started to tell the judge what had happened, and here he was, severely injured. But the judge had the report in front of him, so he did not want to hear any of it from the defendant.
Since the husband was in jail, at least until court, the wife got to go back inside her home.
I never got a subpoena for court, so I assume at some point he pled out.
We never got another call at that house.