Your comment, like many others in this thread, seems to be of the form "what if the police do this other, unrelated, illegal thing?"
The solution is to make sure there are repercussions for cops doing illegal things, not to prevent laws from being passed because cops might try to twist the intention of the law to try to justify illegal acts.
Courts have a lot of discretion in deciding cases, and many cases come down to a question of intent. If 12 cops intentionally body-block someone who is recording, that's something that a judge isn't likely to look at too fondly.