The decal component of the Watch Your Car Program (PDF) allows motor vehicle owners to display a front and back Watch Your Car decal to their vehicle signifying to police, that their vehicles are not customarily driven between the hours of 1-5 a.m. A vehicle owner who chooses to participate in the Watch Your Car decal program voluntarily consents to having his or her automobile stopped, during the program hours, for the purpose of determining ownership and identity of the automobile and driver. Through the Watch Your Car Program, police in any jurisdiction are authorized to stop a vehicle with the Watch Your Car decal and check the identity of the driver if the vehicle is being operated between the hours of 1-5 a.m.
A second type of decal is offered for vehicles not operated near international borders or ports. The Watch Your Car Program allows owners of motor vehicles to display an additional decal on the front windshield of their vehicles to alert police that their vehicles are not normally driven across or in the proximity of international land borders or ports. Similarly, law enforcement in any jurisdiction has authorization to stop vehicles, in these areas, displaying the Watch Your Car International Program decal, to check the identity of the driver.
The vehicle identification number (VIN) Etching component of the Commonwealth of Massachusetts Watch Your Car Program allows owners of motor vehicles to voluntarily have the windows on their vehicle etched with the VIN. Motor vehicles treated with this process are less likely to be stolen because they are less attractive to thieves who would have to replace all of the stolen vehicle's glass in addition to the VIN numbers. The etching is done by the police department. The process itself takes only a few minutes. Massachusetts offers a 15% discount on comprehensive insurance for vehicles with window etching.