Express doubt about the credibility of someone's story, either due to a lack of information or the possibility of the person being dishonest.
There is so much here that simply defies credibility. Which means one of two things: 1) We do not know the entire story (Boyle is deliberately leaving out important parts of the story in order to cast himself in a better light); or 2) This person is one of the most stupid people in Canadian history...