Yes. I think the question of attention and rotation is interesting. There's a psychologist in Switzerland who argues precisely the opposite, that it takes 20 minutes for one to sort of warm up on the scanners in order to be able to detect things, precisely because it's difficult to detect on these images, including for the sit-down X-rays. Rotating people through the post regularly does not seem to be more efficient than rotating them slowly. But that's a minor point.
On April 22nd, 2010. See this statement in context.