The practice seems to be somewhat wide spread (in the distance between departments case). That might be because it came from a Facebook group or forum where Law Enforcement officers exchange tips. The second is the choice of artist (Swift) who has been in a pretty visible battle with ownership of her music. I suspect that if the officers who use this technique thought about it, they might find that using Disney tunes would be more effective in terms of triggering DMCA takedowns.
What it implies, and is explicitly stated in the referenced video, is that a law enforcement officer is explicitly attempting to deny you your 1st Amendment right (as adjudicated by the courts). While the doctrine of qualified immunity would likely shield them from prosecution, it is still a violation of your civil rights and should certainly merit disciplinary action on the part of the police department.