How can you tell?

* The snow around the feet of the moose on the left and car's tires never moves/changes. In real life, there would be a scrape from the tires and tracks from the moose.
* The antlers on the moose behind the car appear and disappear.
* The car is actually a little small and doesn't move the way a heavy cruiser would move when rocked.
* The car is marked simply "Police" with no indication of the town.
* The clip is 10 seconds; why would someone recording stop there? The latest "realistic" AI video generators make clips of 9-10 seconds; if you see something very remarkable that is that length, and it's engaging or politically compelling, it's probably AI.

ETA: If you search for videos of moose ramming cars, you'll find several very similar ones, also AI, across the internet, most having cropped up in the past week or so. In addition to feeding the rapacious plagiarism machine, they also can contribute to an inaccurate understanding of moose behavior.