Very good question. There is no way for certain to tell if they are all on tight, but yes, they all wear helmet cams that can either have the SD cards popped out, or a USB cord attached to a laptop. Funny you mentioned this as in one of our stops our rear changer wasn't sure he got em all tight on the left rear before the jackman shipped it, so they grabbed his helmet cam and our pit crew coach grabbed his camera and they looked. You still can't 100% tell from looking at it as there are so many things different in gun PSI, hand speed, angle nut was hit, etc. A lot of changers know how it "feel" to have them tight, but with all these new pit guns being so different or rotating a few thousand RPM's, things don't feel like they used to.