This is an interesting thing because I can tell you that until I became president of CATSA, I was unaware that it actually took place. It's in the basement of most airports. When you check your bag and it disappears behind the counter, it goes down through a series of conveyers usually into the basement of an airport, and there's this huge conveyer system there that channels your bag to the appropriate high-speed X-ray machine, which CATSA owns. That high-speed X-ray machine analyzes the bag to make sure nothing untoward is in the bag, and if it is clear, then it goes to the airplane. If it is not cleared, then it is searched by one of our personnel to make sure it is safe.
On February 24th, 2016. See this statement in context.