Without question, there is a real dynamic at Canadian airports. Transport Canada describes the passenger protect list, which is immediate threats to aviation, and it is the airline agents who inform the passenger of their ability to board or not board the flight. They then phone a 1-800 number that connects them with the TC folks. The local police are responsible for interdiction, particularly of CATSA, but CATSA has no role in either intelligence gathering or intelligence utilization. Their only job is to look for objects. That's it. It's only objects. So Transport Canada and maybe the police have ideas about who the individuals are, but CATSA just looks for objects.
Were it possible to create reliable intelligence about aviation security, then I would be very excited to see that used. I'm personally not convinced that we have either a global system or even a national system that allows us to identify those threats with enough certainty or with enough timeliness to actually manage it.
So intelligence sharing is certainly useful, and it's certainly helpful, but remember that we would need an equivalent surveillance system to make sure that we understood when those people were entering and leaving the airports.