@deviantollam on vape detection.

https://www.youtube.com/watch?v=lHmjjNxj4sI

Someone in the comments (see the pinned comment) pointed out this interesting talk which I haven't had time to watch to: https://www.youtube.com/watch?v=WCnojaEpF2I

I didn't even consider the privacy/civil liberties consequences of these devices until I saw the pinned comment.