I am always mystified by the knee jerk reaction that a sighting was not a drone (or was a drone, for that matter.) We all make judgments with certain biases including a bias to come to a conclusion that comports with our beliefs even when those beliefs are not supported by facts. As drone enthusiasts, we are pro-drone, but that doesn't mean we should be closed to the idea that some drone pilots do extraordinarily stupid and dangerous things. Given likely low speed of police heli and proximity, I would tend to credit this report.
The FAA report cited by JDawg is not available on the FAA website anymore. While the summary which is available does say that the several (assuming less than 10 and probably closer to 5) reports of drone strikes were not actually drone strikes, it also says that over the nine month period there were almost 1300 "possible" drone sightings by aircraft pilots. That is one **** of a lot and if only a small percentage were actually drones, that is still way too many.