Jim can correct me, but in the vast majority of cases the first one does not expire, because we give the medical instructions at the end of the process, which means normally they don't expire. It doesn't mean that there will be no further medicals for, let's say, TB, that this will not happen. Ultimately we are responsible for the safety of Canadians, so if somebody has done their medical a long time ago, especially in an area where there is a significant occurrence of TB, we have to be careful.
On March 3rd, 2011. See this statement in context.