Police say a man impersonating an officer faces charges after signalling a real detective to pull over on a road in Florida.

St Johns County authorities said 20-year-old Matthew McMahon activated a red and blue light 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. McMahon is charged with impersonating an officer and unlawfully displaying blue lights.

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