No, it was totally ineffective. They never got past going to the Supreme Court of Canada to determine whether it was constitutional. As far as I know, she never testified at an investigative hearing. They tried to do it in the middle of the trial, and that was one of the reasons. Not having had a preliminary hearing and a direct indictment, they didn't know what she was going to say. If they'd had a preliminary hearing, they could have called her as a witness and found out in advance what she was going to say at the trial.
On December 13th, 2010. See this statement in context.