Towers and cameras, not a wall, keep migrants from crossing the border into Arizona

U.S. Border Patrol agent Gabriella Cervantes keeps an eye on displays monitoring information gathered from the Integrated Fixed Towers at a border patrol facility on March 16, 2018 in Nogales, Ariz. (Brian van der Brug/Los Angeles Times/TNS)

NOGALES, Arizona: In the high desert east of this border town, the rolling hills topped with mesquite and palo verde trees are a picture of rugged desolation. 

But there are flashes of movement: Darting between bushes are five migrants who just crossed into Arizona, not far from a road where they could hop into a car to continue their journey.