Even if Wilbur's Fountain is within a school zone, I'd still conclude yours is a bad assumption, particularly given the nature of the charges levied against him, as well as his status as an illegal alien. Furthermore, local law enforcement doesn't charge people for violating federal crimes, hence his status as "placed on an ICE hold pending federal charges by the U.S. Attorney’s Office."I think that this pretty much settles the question, at least for El Paso County, of what the police will do. So if you get pulled over for a traffic violation within a school zone while carrying, you should be fine.
Finally, he may be tried and sentenced here, or simply deported once U.S. and Mexican Attorney's offices can agree on the arrangements. Criminals who cross borders between two friendly nations are often deported upon committing a crime, depending on the nature of the crime. In his case, he'd not comitted a burglery or hostile act, so in all liklihood, after being charged from all sides in order to gain more leverage with their Mexican counterparts, he'll simply be deported to face the music there.