Cripes, I started something.
Well, thanks for all the considered and unconsidered responses.
I was pretty clear about what I was saying - given ONE scan that's what I would do. I agree that if you repeat it and you effectively had a sign stating that no white women over 70 will be scanned that just might give people a starting point to get round your security.
I will also say that I'm not sure you could persuade most old grannies that Jihad is a good idea. Suicide bombers tend to be younger; old people mellow too much. So I'm afraid you're never going to get her to do it for you, no matter how many cakes you buy her. Not even the nice ones with the rice paper on the bottom.
As to the last A/c (at 16:52) who has called me stupid, bear in mind that if the most stupid man in the world tells you it's raining, it has no bearing on the truth or falsehood of what he's saying, so it might be worth taking an umbrella. Also, Sonny Jim, I know more about conditional probability than you will EVER know. I guarantee that unequivocally. Given the amount I know, the probability of your knowing more is, frankly, close enough to zero to ignore. However, that has no bearing on the accuracy of my argument, so feel free to assess the facts rather than knee-jerking out the "stupid racist" card.