I can show you my passport; it was never stamped in Spain. I mean, I can't prove with certainty, but I can prove to you on a balance of probabilities I've never been to Spain. I couldn't prove it 100%. If someone said I wasn't responsible for the Syncrude tailings pond discharge, I couldn't prove that with 100% certainty, but I could probably convince you on a balance of probabilities that I didn't cause that.
Evidence of meeting #31 for Environment and Sustainable Development in the 40th Parliament, 3rd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was right.
A recording is available from Parliament.