I don't often just link to a news item or op-ed without further commentary on the content. This is an exception simply because I can't think of anything more to add to this excellent op-ed by Peter Bowal, UofC Law Professor. Oh yes one thing, full disclosure, Peter used to work for me as an Associate in my law firm more than a few years ago.
In a world were political integrity and transparency are touted, prevarication and deceit still trump the truth in context. If you want to go deeper into the "heart and science" of this behaviour an easy enlightening read is "Mistakes Were Made but not by Me."