I think PD commoratives have their place and it can be any where from a shooter to a prized collectable. It's too bad that they aren't thought of more highly by more folks considering who and what they are honoring/commemorating versus a "regular" commemorative:

San Francisco Bay Area Rapid Transit (BART) Police M586:





CHP M68-2... which basically a M-66 chambered for .38 Special only:

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Conrad
SWCA #1830 SWHF #222