A blast from the past
My Uncle, who just retired from the LAPD, was a bank robbery investigator who wore civvies. His only carry throughout his entire career was the venerable Smith and Wesson Mod 37 Chief's special which he carried tucked into his belt at the small of his back.
My cousin, who was a former uniformed police officer with the Daly City Police Dept (Calif), carried a Colt Python. My, how times have changed.