> We have windows, tiny little cameras that go through walls, and we can ping cell-phones. Correct me if I'm wrong, but wouldn't all of those work better than t

> We have windows, tiny little cameras that go through walls, and we can ping cell-phones. Correct me if I'm wrong, but wouldn't all of those work better than this incredibly convoluted method? This is research. Currently it's unreliable (83% is super low) and convoluted, but with more research and investments, it is possible that they would be able to make it reliable and practical.