Keep conversations with cab drivers or hotel personnel courteous, but do not give out personal information. It may be used for criminal purposes.
Remain sober while traveling.
Beware of criminal impersonating police officers, especially when you know you have done nothing wrong. Examine badges and credentials carefully. Call the agency if you are unsure.
If they want to place you in a vehicle or move you to another location or if you have doubts, be courteous and ask them to call for a uniform patrol car to respond.
If you are in an unmarked car and something they say or do clearly tells you they are not real police, then crash the car.
If you receive a phone call from someone claiming to be a police officer, find out which precinct he or she is calling from and call back to verify.
If you are approached on foot by someone flashing a badge, demand a uniform patrol car.
If you are driving lawfully and carefully in an isolated area and a suspicious unmarked car pulls up with a plain-clothes driver asking you to pull over, take no chances. Even if you see a flashing dashboard and single roof light, be careful. Signal to the suspect officer to follow you to a safer, crowded area. If you are stopped, request that a uniform patrol car be sent. Keep your car locked, windows up, and engine running. Ask for the phone number of his precinct. Call 911 if you feel you are in danger and let suspect see you doing it.