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by Ichthypresbyter 1110 days ago
In the UK, traffic cops used to have "Black Rat" stickers [0] on their personal vehicles (for various reasons they are nicknamed Black Rats- this started out as a derogatory nickname from other police, but they adopted it as a point of pride).

Once it became clear that the stickers were being sold to the public, they stopped working as a way to avoid being pulled over.

[0]http://bluelightgifts.org.uk/stickers/