It has not come up in the past in this committee.
It's funny you should say that. I'm reading The Power of Parliamentary Houses to Send for Persons, Papers and Records, because it's time to be a technical geek.
My understanding—perhaps the clerk will correct me if I'm wrong—is that whether people are sworn in or not, under parliamentary privilege it is still contempt of Parliament to mislead the committee by giving a false statement or false evidence; to refuse, unless related to cabinet confidence, to answer any questions; or to fail to produce documents that this committee might require someone to produce.
That is my understanding.