What is the law, and why would they do this? >> so what happens is that the defense is going to be relying upon self-defense. in order to do that, they're going to predicate that defense on we were making a citizen's arrest. why were you? because the law would provide. if you see that a crime was committed in your presence, that crime happened to be a felony, what it would allow you to do is otherwise detain someone for purposes of them violating the law. >> what's the civil war aspect? >> what's that? >> what's the civil war aspect? >> well, the civil war aspect is that's when the law was for...