I'll give you another example. In Vancouver, some people have a level four qualification. At that level, it's no longer necessary to requalify. At level three, you must take an exam every year to see whether you're using too many anglicisms, for example.
I'm thinking of certain people who reached level four 20 years ago, when they were married to a francophone. They then divorced, and they may not have spoken French in 10 years. It's now difficult for them, but they still have their French qualification.