As I also clearly watch Border Security too much, this seems to the case law that the CBSA will site if you refuse to provide the password. Stems from a truck driver in Ontario who was caught with child porn on his laptop while crossing the border. In one episode of Border Security, a CBSA supervisor actually printed this decision to show to the traveller.
http://caselaw.canada.globe24h.com/0...-oncj-25.shtml