Indeed, on May 9, Health Canada cancelled the authorization for the importation and sale of a KN95 respirator and, in addition, contacted a number of other MDEL-holders to change the labelling, which does represent a recall in the definition we use to indicate that they don't meet the N95 filtration standards. Relabelled, they could be used as face masks. That process has happened, and we issued, on May 11, a public advisory to that end, in addition to contacting those medical device establishment licence-holders.
On May 22nd, 2020. See this statement in context.