https://en.wikipedia.org/wiki/Fair_use#3._Amount_and_substan...
Basically, the record company would have to make the case that because this cop played the song, they are losing sales because I guess people are listening to this instead. And not on YouTube, in person, because the person posting it on YouTube would be the one responsible for that. These arguments are utterly absurd.
You can't successfully bring a tort case (which copyright infringement is) if you can't demonstrate harm.
Where did you go to law school, exactly?
Copyright infringement is not tort. Copyright infringement is a creature of federal law, not common law like tort is. And copyright owners can claim statutory damages of up to $150,000 per work in lieu of actual damages at their election. See 17 U.S. 504(c).
And fair use is a defense to a prima facie copyright infringement claim.