As stated, unmarked vehicles with the proper emergency equipment (primarily red and blue lights) are frequently used for traffic enforcement, and the State Patrol is one of the biggest users of unmarked vehicles for traffic.

To the best of my knowledge, it is illegal for non-law enforcement to have red and blue lights in their vehicle. This law was changed within the past few years due to impersonation cases.

When in doubt, call 911 while driving at a safe speed to a populated area before pulling over. The dispatcher should be able to confirm that the car pulling you over is a genuine police officer.

Hope this helps.