I think it's even more complicated in that clearly CSIS was aware that they had shared a great deal of information with the RCMP with respect to a project that became part of the foundation of their information on Project A-O Canada.
What they didn't know was what had been added to this was an assertion that Mr. Arar was a suspected terrorist, as I understand it. I'm probably getting into information that I shouldn't be sharing. Probably I read it in material that I shouldn't be sharing.
But the fact of the matter is they may have been assuming that they knew what information was there and later found out that there was additional information, which may have come from another source that they didn't know about.
So information sharing is two-way for the most part, but in this particular case, matters were added and not fed back to the origin of the information. Then they were put in a very difficult position, as I interpret it.