Some enterprising individual should purchase the data for the sole purpose of publishing activity of politicians, judges, and so on. I bet you the laws would change in a hurry.
Source? That sounds like it would run afoul of the 1st amendment. Most likely it's actually implemented as something vague like "intimating a public official", and prosecutors use the threat of a charge to bully people into stopping.
Or more simply, cop car detectors that publicly share where all police are in a vicinity based on camera footage. Just need some enterprising anarchists to let us leverage their ring footage. Can even do it real time!