I believe it's in the players guide to zeitgeist that, at least in Pathfinder, that due to training and laws that Constables are able to deal non-lethal damage without issue.
Police shouldn't be just running around and killing people, so I generally give them the opportunity to do non-lethal damage whenever they choose. Sometimes I make them specify. Sometimes I offer clues to whether people are nearly at 0hp and see if they specify accordingly.
And in some cases regarding enemies that the PCs have history and grudge with - such as Lorcan Kell- I'll require a willpower sav or check to do non-lethal damage
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