When you confront people who have on spy glasses with cameras in them to ask if they are recording you or your children it's incredibly effective at getting them to put them away.

It's mostly possible to tell if someone is using a phone or a camera to record something, even from a distance.

Wearables are trying to make a new permission structure where you might not know what is being recorded.

Spy cameras have existed for decades and they have always been creepy.