People get so used to some things, it makes it easier to work undercover. Taxi who would have thought it, about like the state parking those white vans in construction zones with cameras and speed guns to catch the speeders in work zones. We get used to seeing things and its a method to say, that cannot be an officer its a taxi. In all honesty, I would think that an agency would contact their district attorney or someone before trying to do such a thing, to make sure they are on board and will not throw out the tickets issued, and having the ducks in a row.