He can keep them in jail until their identity is verified. That's a first. But I am sure they have plenty of excuses. Like the jail is overcrowded and we need the space to keep real criminals. It sucks that the drunk illegal ruins a citizens life. Sucks that it doesn't happen to the judges family or the prosecutor family or the sheriff's family. It's always someone else's fault.Oh I figured you meant immigration laws. Federally they cannot do anything as far as immigration. But those laws as to pertaining to license, fake id, DUI ete they absolutely can enforce the law. And they do. but then you have the DA and AG, that's a completely different circumstance unfortunately. So law enforcement can make arrests but it the courts don't punish the offenders then that is beyond law enforcement's control.