If you knew you were being recorded, had reason to be believed it would be broadcasted and your stated intention was to turn that otherwise normal and non-infringing broadcast into copyright infringement, ya, you might have an issue with the courts.
Taylor Swift and her record company would be the plaintiff in a copyright case. They cannot claim harm here.
It's simply not a copyright case. If there is a law on the books that says that cops can't use sneaky methods of avoiding accountability, then that's a court case. The public is harmed, not the owner of the content.
Better yet, the cop should just be fired for doing something that is clearly against the public's interest, making the department look bad.
