I have actually seen posts about the Arar case questioning whether Arar was actually tortured. Of course the RCMP investigator who received Arar's confessions from the Syrian authorities also thought that they were not the result of torture. He by the way had absolutely no training in assessing this according to the O'Connor report.
The Arar inquiry appointed Prof. Stephen Toope as a fact finder to ascertain if Arar was tortured and to what degree. His 27 page report is readily available in PDF format on line free!
Toope also heard testimony from Al Malki, el Maati, and Nurredin(sp?) who also claimed to be tortured in the same jail. THe Iacobucci inquiry is set up to inquire into their cases.