I used to drive a retired police vehicle and people on the road would slow down and move over for me all the time. If it was ok for the police to sell me that car with only the decals removed, then I don't see a huge problem with this.
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"Laws that forbid the carrying of arms... disarm only those who are neither inclined nor determined to commit crimes. Such laws... encourage... homicides, for an unarmed man may be attacked with greater confidence than an armed man."-Jefferson