I'd like to mention that this is the responsibility of the Public Service Commission of Canada. It's under its authority that an exemption is granted regarding language requirements.
Positions for which language requirements do not need to be met are positions that are staffed on a non‑imperative basis. I'd have to check to see what the number is, but I can tell you that they represent 1% to 2% of appointments. In that case, an employee is given two years to learn the second language. During that time, the department must ensure that employees' rights are respected. So we make sure that a colleague takes on the supervisory duties of the employee who has to learn the second language.
I'd add that it's sometimes a matter of moving an employee from the BBB level to a higher level, such as the CBC level. That doesn't mean that people aren't at all bilingual. It's more that they don't necessarily meet the language requirements at the higher level.