Working on a 74 440/RR that was rumored to be originally a police interceptor.

I see lots of evidence to support this. The car was weirdly optioned, like a police car might be. It still has a shotgun rack in the trunk, several holes where antennas would have been mounted, and even inner fender shields to limit air into the fenders at higher speeds.

There are a couple unusual lights behind the grill, not in front of it, like road lamps would be mounted and I recently noticed an extra switch above the high beam switch.

Is this extra switch indicative of something they would mount on old police cars or is it just a remnant of some wayward repair?

Just curious.