Prior to leaving a small town PD back in the late 70's, several of us carried a Raven .25 auto in a "wallet holster" as a backup . I can't recall the brand name of the wallet holster, but it did work well. Once I got to the bigger PD, nothing below a .380 was authorized for a back up, so the Raven and wallet holster was sold. I was surprised to read that some states outlaw this type of holster and or the FED's are involved.