blue light bandit
n.— «A 53-year-old Monroe High School teacher refused to stop her car Thursday after being followed by a suspect flashing a blue police-style light on his pickup truck. Reports of a blue-light bandit who stopped women using such lights have been filed in Mecklenburg and several surrounding counties in the past year.» —“Police have arrested two men they say were selling crack cocaine” The Herald (Rock Hill, S.C.) Oct. 11, 1991. (source: Double-Tongued Dictionary)