Drones, towers, license plate readers, and other surveillance tools comprise a “digital border wall” that threatens privacy and civil liberties, according to a new report from three immigration advocacy groups. The Deadly Digital Border Wall report criticizes law enforcement’s surveillance of the U.S.-Mexico border, but the tools described in the report could be—and have been—used against all American residents as the government ramps up programs to counter domestic extremism. The report—published by Mijente, Just Futures Law, and the Rio Grande Valley No Border Wall Coalition—details two main tools law enforcement uses to track migrations: drones and towers. Additionally, the government uses a wide array of surveillance systems and databases to track all people who cross U.S. borders—illegally or otherwise. According to the report, there are at least 55 surveillance towers along with Southwest border. These structures are 80 to 140 feet tall and are equipped with day and night cameras and a radar …