When its time to grip the road, path or trail the terrain you ride is the important factor.
The thing to consider for your type of tire is where is my beat or patrol area. Safety and comfort concerns are important to the bike patrol officer. Let take a look at whats out there. The most common is a light knobby to more of a street tire option. Check with who you buy your bike from, many like 4Bike-Police.com are happy to swap out to the tire of your choice.