..its not something that is new. Maybe has a cute new name and a reporter blew it into a great sensational story...but observation (which is ALL that this is) is an important part of surveillance and detection.
It would be WONDERFUL if we lived in a world where there were no bad people needing to be detected.
We don't.
There will ALWAYS be abuses. The ex-military WV cops were jerks...and our one favorite did absolutely have a bug up his butt...
but really, how are you supposed to detect bad things if you aren't allowed to look for them?