R.I. Gen. Laws § 42-11.3-3: Identification of vehicles owned by a governmental body.

The division of motor vehicles shall issue a distinctive colored plate for vehicles owned by a governmental body. The division of motor vehicles shall determine the color of the plate. Each vehicle owned by a governmental body shall display a decal on the rear window. The decal shall state: “Please report misuse” and the telephone number established for reporting shall be inserted. Unmarked law enforcement vehicles and the directors of various state departments are exempt from the provisions of this section.