I'd also like to see some evidence of this. But my understanding is that the purported mechanism is some sort of infrared beacon shone into the camera (like the eurion constellation, but live); it's something that could be activated without Apple or Google's involvement in the moment.
My point is more that this seems like a feature that no phone company would install without a law requiring it, if it's really in there, this feature would be really, really dangerous because any criminal could then just use the same equipment to disable cameras. It's also pretty bad to be depriving people of the use of their property against the 4th amendment and probably the 1st as well considering it's limiting photography and free expression as such.
