For years, these inspections have been conducted before cattle cross the border, but the drug prohibition war has prompted the U.S. to move some of its operations north. The change, instituted over the past year at three of the 11 ports along the U.S.-Mexico border, is drawing concern from some cattle raisers, who fear infections long eradicated in the U.S. but still showing up in Mexico will spread before inspection. The change is supposed to be temporary, although there are no immediate plans for the American inspectors to return to Mexico.