In Northern California a P.O. who worked as a State Fire arson investigator caried a loaded shotgun in his Pick up that he parked at the hall.
A few of Silicon Valley Elders( aka: servants) (cops) wore guns under jackets while on the platform in the 60s,70s, early 80s.
An ex-cop brother with a ccw was used as a "bodyguard" to make bank deposits for San Francisco Cow Palace conventions in the 90s.
In the late 40s the Bethel factory night watchman had a .38.
The whole concept of "concealed" = you shouldn't know who does or doesn't. :)