We do not do that as a matter of practice. I don't think we have ever done that in practice. Although we have the authority to compel people to testify, and to do that under oath, we usually receive co-operation from the organizations that we investigate, or the departments that we investigate. However, we have these powers, and I would not hesitate to use them if I faced a less than co-operative organization.
On May 1st, 2018. See this statement in context.