Flock Safety CEO Garrett Langley unveiled several changes on Thursday to the company’s nationwide network of automatic license plate readers used by police, amid accusations that the sprawling system creates a surveillance state that violates constitutional rights. 

More than 6,000 municipalities have contracts with Flock, with over 120,000 cameras active across 49 states, according to the company. Unlike red light cameras, which are triggered by a violation, Flock ALPRS captures a digital fingerprint of every passing vehicle. Police agencies can share data across state lines with other law enforcement departments, as well as with government agencies. The system has sparked questions about long-term tracking and privacy, in addition to possible infringement of Fourth Amendment rights for information obtained without a warrant or court order.