Running a red light usually does not result in arrest. But if someone ran a red light and then refused to show their license and got arrested. Well, if their child was with them, then the child would not be put in the same prison that the parent was put in. ie. they would be separated.

I didn't read the law so I may be mistaken, but based on my understanding is someone comes to a proper boarder control and claims asylum then they will not be arrested. The ones being arrested are the ones who are crossing illegally and then when caught, claiming asylum.