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The U.S. Border Patrol is monitoring millions of American drivers nationwide in a secretive program to identify and detain people whose travel patterns it deems suspicious, The Associated Press has found. The predictive intelligence program has resulted in people being stopped, searched and in some cases arrested. A network of cameras scans and records vehicle license plate information, and an algorithm flags vehicles deemed suspicious based on where they came from, where they were going and which route they took. Federal agents in turn may then flag local law enforcement.

Suddenly, drivers find themselves pulled over — often for reasons cited such as speeding, failure to signal, the wrong window tint or even a dangling air freshener blocking the view. They are then aggressively questioned and searched, with no inkling that the roads they drove put them on law enforcement’s radar.

Once limited to policing the nation’s boundaries, the Border Patrol has built a surveillance system stretching into the country’s interior that can monitor ordinary Americans’ daily actions and connections for anomalies instead of simply targeting wanted suspects. Started about a decade ago to fight illegal border-related activities and the trafficking of both drugs and people, it has expanded over the past five years.

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The result is a mass surveillance network with a particularly American focus: cars. The Border Patrol has for years hidden details of its license plate reader program, trying to keep any mention of the program out of court documents and police reports, former officials say, even going so far as to propose dropping charges rather than risk revealing any details about the placement and use of their covert license plate readers. Readers are often disguised along highways in traffic safety equipment like drums and barrels.

And it reaches far into the interior, impacting residents of big metropolitan areas and people driving to and from large cities such as Chicago and Detroit, as well as from Los Angeles, San Antonio, and Houston to and from the Mexican border region. In one example, AP found the agency has placed at least four cameras in the greater Phoenix area over the years, one of which was more than 120 miles (193 kilometers) from the Mexican frontier, beyond the agency’s usual jurisdiction of 100 miles (161 kilometers) from a land or sea border. The AP also identified several camera locations in metropolitan Detroit, as well as one placed near the Michigan-Indiana border to capture traffic headed towards Chicago or Gary, Indiana, or other nearby destinations.

While collecting license plates from cars on public roads has generally been upheld by courts, some legal scholars see the growth of large digital surveillance networks such as Border Patrol’s as raising constitutional questions. Courts have started to recognize that “large-scale surveillance technology that’s capturing everyone and everywhere at every time” might be unconstitutional under the Fourth Amendment, which protects people from unreasonable searches, said Andrew Ferguson, a law professor at George Washington University.