Smartphones were the beginning of the end of that difference. This is the obvious next step. What about when this kind of tech is so small that it's embedded

Smartphones were the beginning of the end of that difference. This is the obvious next step. What about when this kind of tech is so small that it's embedded in contacts? Even if you think that's twenty years off, still, surely it's obvious that it's coming? It's possible not to notice that someone is video recording you at the moment, but soon it will be essentially impossible to know if they are.