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a COP on doughnuts:

I think the cop/doughnut thing came around because cops, working late at night, need coffee to stay awake, and the only way to get coffee in the wee morning hours is at the all-night doughnut places. So the doughnut thing may not be accurate. In fact, my buddy Stan has been a cop for 33 years and has never eaten one because the association bothers him. But me, I love doughnuts: old-fashioneds, apple fritters, buttermilk bars, cake, maple bars, twists … all of them!

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— Good Magazine interviews some people on the food/beverage closely related to thier profession.  For the record, I also love doughnuts.