That is true. I've seen it happen a couple times where someone ended up in their own realm's prison. The judge then bans from the regular ban page, not the dungeon page. That way the prisoner doesn't get tossed out when banned. Then you wait until the ban goes into effect. Once the ban is active, the judge can do anything they want to the now-rogue prisoner.
This would be *extremely* powerful, and allow the judge to effectively capture/execute anyone they wanted. Or capture and ban even nobles who had protection from their lords via good marks.
There's a lot of thought that would need to go into something like this.
