stool pigeon

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And the main difference between a homing pigeon of old, and a stool pigeon of today?
Most of these guys turn themselves into stool pigeons for the first brassy female who gives them her blessing, usually a svelte take-no-prisoners blond who bears a striking resemblance to right-wing attack poodle Aim Coulter.
Meanwhile, one can envisage a scenario in which bobbies are set-up night after night by dodgy-looking stool pigeons who will walk away from the encounter with their precious pieces of paper, howling with laughter, while around the corner one of their mates is legging it with a sackful of swag.