law enforcement's choice to use the 12 gauge is not a decision that is based on what is the best tool to use but what is simply available to the agency.
not sure where you live but i live in Dallas Texas where the Dallas police annual budget is a whopping 233 million dollars ( i just looked it up ) and there officer's provide there own shotguns according to several friends of mine who own and work in local gun shops around the area and they ALL BUY 12 GA. SHOTGUNS ...now again I'm no ballistic expert and i certainly do not have to defend myself or have a need to protect your lives on a daily basis but .............i think that if i were to purchase a weapon to protect myself i would use the advice of those who do that very thing!!!
I'm still scratching my head as to why this "discussion" is still up?