I'm all for people practising there beliefs in the way they see fit(I best say "as long as i does not harm others" but I think that goes as a given).
Calling for a ban on them for security reasons is like banning the internet because you can find how to make a nuclear bomb. I train people who work for the NHS so a very diverse bunch, I never adjust how i treat people on what they are wearing, but on what internet browser they use but on how they act. Sometimes you cant help but pre-judge but that should not effect how you treat them, its always nice to be proven wrong. What does it matter if it is a man or woman under there, I have no plan to date them either way.