Well..of course it's illegal. It's...Unconstitutional. Naturally.
But the system is entrenched and powerful: 'Do you want to kill jobs?! What about Our Safety!??!'
I say: Yes, Absolutely: pay those smart people to do something more useful than underwear-drawer peeking...and Complete Safety is a pipe dream...I for one would rather be unseen and 'free' as opposed to being monitored and 'safe'.