I agree about the two officer patrols, but I do realize that doing so halves the number of patrol units per shift.
I'm not as familiar with shotguns as I should be - what's the performance of 12 or 20 ga. slugs against Bad Guys' body armor? In the city, where I just moved away from last month, I could see rifle round overpenetration being a real problem. Out here where I am now it's much less of an issue.
As most LEO patrols are reactionary in method these days the 2 man unit makes sense to me.....but that's just me. There will be pros and cons to every scenerio that are valid so it a call for the individual department to make IMHO.
As to a slug....It will not punch a threat level IIIA NIJ rated vest , yet will break ribs and make the person hit wish they were dead.
Head shots with 00 Buck .......potential for stopping the threat is "better" but not a sure thang !
Stay safe !