Further, cops have learned to just play copyrighted music (say the Frozen soundtrack) when they see they are being recorded, that way if people upload it to the internet, they can rest easy that Disney will hit that video with a copyright strike and the video will be taken down before anyone can see it.
Thankfully for protestors, audio editing exists, and certain AI tools have become very good at stripping certain audio from videos while keeping relevant audio. Leave it to cops to choose a “brute force” solution every time when finesse is all you really need to bypass their brute force.