They're on squad cars and street lights, and they track where you're driving. Across Minnesota, police and sheriffs have been using automated license plate readers for years to find stolen cars and aid investigations. Their spreading use and questions of data security, fueled by recent breaches of statewide databases, has focused attention on the lack of regulation. Until the data was temporarily classified late last year, anyone could ask police for a list of when and where a car had been spotted. Lawmakers will soon consider restrictions on the data stored via the readers, with state Rep. Mary Liz Holberg,...