A real ATF undercover op
Story here. As the author notes, the guys who do this face two risks. (1) Getting killed by the targets, who are now into background checks! (2) Being ruined by backstabbing superiors, as has happened to agents in the past if the operation wasn't 100% successful. Then it goes to finger-pointing, and the guys at the bottom of the bureaucratic food chain wind up on the receiving end.