I don't like carry without a holster, but still... Does Wisconsin law require holsters for carry by off-duty LE or CCW? Does Wisconsin law mandate safeties for semi-autos? If not, the charges seem to be BS.
Meanwhile, I would guess an M&P, but it could have been a P99, Sigma, 4066 DAO etc. Can't expect modern media to get gun details, though... Or explanations of applicable laws...