Colorado lawmakers made impersonating a police officer a felony last year, increasing the penalties to two years in prison and a $100,000 fine. The toughened law followed the killing of 20-year-old University of Northern Colorado student Lacy Miller in 2003.
Other jurisdictions may have to consider following suit.
Over the past six weeks or so, authorities say men have posed as police officers in Ohio, Massachusetts, Pennsylvania, Louisiana and Virginia.
Authorities say motorists leery about being stopped should put on their flashers and drive slowly to a populated or well-lit area.