Every year there's this big convention somewhere around Detroit or something where they compare all the various cars that are candidates for police use. The one overriding trend is that the most favored are large. If you're going to spend some 10 hours a day in a vehicle packed with computers, radios, emergency equipment, shotguns, spike strips, and a crapload of other stuff in addition to the occasional very bad men, you need room. The Prius would never in a million years be suitable. Toyota's only hope of breaking in to that market would be with the Avalon perhaps.