Government use of license plate readers has drawn attention in the United States, especially in Southern California during the past year. In 2024, an investigation reported that federal agencies placed hidden cameras along roads in San Diego and Imperial counties near the border with Mexico. The cameras were placed inside traffic equipment, including construction barrels, so drivers could not easily see them. Privacy groups raised concerns because the cameras collected information from many drivers without clear public notice. The system was used by U.S. Border Patrol to study travel patterns and find vehicles seen as suspicious.

The cameras record license plate numbers, locations, and travel times. Computer programs study this data to find certain travel patterns. Court records show that vehicles may be flagged based on routes or time spent near border areas. Federal agencies may share the information with local police, which can lead to traffic stops. Supporters say the system helps law enforcement protect public safety. Critics say the system is not clear to the public and may affect people who are not involved in crime. Legal experts say clear rules and oversight are important.