"Durango's dairy heifers have moved from the region where TB has been confirmed, which cannot ship cattle to the U.S., into the region where shipments are allowed, the department said."
Looks like they're trying.
LOL! Leave it to the mexicans. I figured they'd find a way. Cows are too big to fit in a car trunk, stuff in a pinata, or cover with tumble weed to enable them to blow across the border.