Vince Li, the man who murdered of Tim McLean aboard a Greyhound bus in Manitoba, is pictured in this August 5, 2008 file photo as he was being escorted by officers on his way to a court appearance in Portage la Prairie, Manitoba. (QMI Agency files)

Ah, the brain.

For a psychiatrist to testify so definitively, for example, that Greyhound bus killer Vince Li has a 0.8% chance of reoffending, the brain must be a very simple instrument to navigate and decipher.

A zero-point-eight chance of derailing again. Now that seems a little too precise to be credible, don’t you think?

But that, indeed, is what a psychiatrist at the Selkirk Mental Health Centre near Winnipeg told the review board that then decided to allow escorted day passes to the severely schizophrenic Vince Li who, because he was tired of being on the drugs that straitjacketed his demons, had unfathomably murdered, beheaded and cannibalized a fellow bus passenger named Tim McLean who was sleeping in a nearby seat.