Looking at Firearms of the USA they issue M&P 40 but doesn't designate shield or fs. Looking at thier uniform and appearance document issued this past sept. they issue 2.5 inch basket weave duty belt. Comparing pictures on facebook knowing the size of their duty belts no it's not a shield.
However, they may issue them for plainclothes, detectives, parole, juvenile officers etc. Those who are less likely to get into a firefight or need small for concealment purposes. It's not uncommon to have different issue for different divisions.
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