Fingerprints are left behind on the border fence between the U.S. and Mexico outside of Nogales, Arizona. Photo by William...

Photo: Handprints at the border

At the U.S. border fence with Mexico, just outside of Nogales, Arizona, handprints are left on the iron posts when people try and scale the wall to get into the U.S. These prints are everywhere, and they go right to the top. Border patrol agents said they can often identify people who have just illegally climbed the fence by the telltale rust stains on their hands and clothing.

This is part of an ongoing reporting trip for the PBS NewsHour about the border, including the challenges of scaling up border operations under the Trump administration, how local communities are responding to these border protections and how new infrastructure might impact local wildlife.

See more of the PBS NewsHour’s dispatches from Arizona: