HD,
Speaking to an aviation doctor it is very difficult to detect this problem - in fact there does not seem to be (unless a medic out there corrects me) a very conclusive test to find this defect even with the best will in the world. I think the issue here is that the widow has "criticised" the medical examination and the authorities without asking the question whether there was anything that could have been done. Fine if there was a test that cost £10 and could detect it, but there isn't. Going to the press before understanding the issue is not helpful and I would always ask the question whether the person who had died as a result of something would want the person left alive acting in the way they did by talking to the press while maybe not knowing the full picture.
J