Depends on if it's using IR to illuminate. I guess I was thinking of dystopian settings where there's a camera on every signpost, tracking your every move. In t

Depends on if it's using IR to illuminate. I guess I was thinking of dystopian settings where there's a camera on every signpost, tracking your every move. In these cases, I'm assuming they'd be very interested in what goes on at night. Now, realistically (at least for now) the bigger concern will probably be cameras tracking you in well lit malls, stores, things like that. In those cases, you're probably very right. Either my idea wouldn't work in those cases, or something in the visible spectrum would have to be used instead- something that couldn't be filtered out.