This is a first, as far as I know. The FCC’s tried to bluff their way into busts in the past, but not past actual cops.
In June, FCC Enforcement Bureau field agents made a run into Mount Carmel, Tennessee, to investigate unauthorized jamming of a police radio channel in the area (the problem had been going on for months before the FCC got around to sniffing around).
While in town, the agents ran into Mount Carmel and Church Hill police officers not once, but twice, on traffic stops. In both instances, the FCC folks told the local cops that they were part of the Tennessee Bureau of Investigation Meth Task Force. They had no credentials to back up their claim, and that made the cops suspicious.