As the political clash over the Trump administration’s “zero tolerance” immigration policy has played out on the U.S.-Mexico border, hovering above is the growing presence of drones.

These small unmanned aircraft systems are piloted by multiple interests — drug traffickers looking for a way into the country, the U.S. government trying to keep them out, and even journalists hoping to get a new point of view on an issue that has gripped headlines for weeks.

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