In the federal government, when former public servants are called to testify before commissions of inquiry, in litigation, before the FPSLREB or perhaps at parliamentary committees, it's not uncommon for them to be brought back on a casual contract to facilitate their access to the information and support they need to prepare themselves to testify on behalf of the Crown.
Therefore, I brought him in on a casual contract to facilitate his access to the information that he sought to prepare. That's the convention that I was working under when I made that arrangement. If it turns out that this was not required for him to access the information that he needed, I'll take responsibility for that.