The medical files are looked after by either medical personnel or by medical clerks who deal with those files exclusively. They are not part of the normal personnel file that transfers. Medical files are kept separate from every other file, so I'm fairly confident about the integrity. No system is infallible, but from my perspective it's as good as we can get until we go to the electronic files with the heavier safeguards.
On June 5th, 2008. See this statement in context.