Predator drones are now patrolling international borders in the San Diego area.

The use of drones has been a longtime source of controversy and protest by the public.

A group called the Electronic Privacy Information Center reportedly obtained information via the Freedom of Information Act confirming U.S. Customs and Border Protection has purchased 10 Predator drones since 2005 to protect land and sea borders.

According to Channel 10 News, the documents confirm the drones are capable of “identifying a standing human being” and “recognizing a backpack.” While the drones are reportedly incapable of identifying a specific individual, U.S. Border Patrol agents say they have been effective.

Since their implementation, the drones have been able to identify and locate almost 4,000 undocumented immigrants and aided officials in apprehending drug smugglers carrying nine tons of marijuana across the border.

The drones’ presence have not been met with silence by some San Diegans. Protestors gathered on Friday in front of the La Jolla home of General Atomics’ CEO Neal Blue. Some wore costumes, carried props and sang songs protesting the use of drones. Others read the names of Middle Eastern children killed in drone strikes.

Police were present to ensure the protest didn’t get out of hand, although no arrests were made. Police confiscated a remote control led helicopter decorated to resemble a drone because the owner didn’t have the permit necessary to fly it, but it was later returned to the owner with a warning not to fly it again.

In response to the protest, General Atomics told Channel 10 News it “is involved in developing transformational technologies, such as electromagnetic systems, airborne sensors, and energy research. It also manufactures remotely piloted aircraft systems, which protect our troops and support national security. GA is honored that it can contribute in this way while at the same time recognizing the right to demonstrate.”

The protests were scheduled during the National Anti-Drone Days of Action from April 4-7, kicking off a month of nationwide demonstrations and rallies against the use of drones.

“The U.S. government has lost its moral compass,” Carol Jahnkow, Emeritus Director of the Peace Resource Center of San Diego stated in a press release. “Over 4,000 lives have been lost to American drones made right here in San Diego, yet only 2 percent of those hit were considered high-level targets. The deaths of these innocent people is reprehensible.  And, the deaths of the other 2 percent without due process of law makes a sham of international law.”