A coalition of civil rights groups on Tuesday asked a state judge to order one of New York’s largest suburban counties to stop its deployment of nearly 600 license plate readers, calling it a warrantless and “indiscriminate surveillance system” that violates the state constitution. The class action lawsuit also alleged that Westchester County never got proper authorization to launch the program, which has amassed a database of 1.6 billion plate scans that has been shared with more than 50