Police say a man impersonating an officer face charges after signaling a real detective to pull over on a road in Florida. Authorities claim 20-year-old Matthew Michael Lee McMahon activated a red and blue light Monday while driving behind an unmarked sheriff's car. Detective Chance Anderson pulled over and was shocked to see an unknown face behind the wheel of the other car. Reports are that during his more than 10 years of service the detective has arrested several police impersonators. But none had ever ordered him to stop his car. McMahon is charged with impersonating an officer and unlawfully displaying blue lights.