That's what I thought too,. As I was searching for possible answer for this matter and yet I didn't find any accurate answer. But anyway, when I tried to email the CBSA and asked them, when the officer swipe a passport, if it really show on their computer screen about the arrest and probation. He answered, "I'm unsure exactly what shows up on there screen initially, however based on the fact that many people with criminal convictions travel into Canada everyday it's only intuitive that the criminal record does not show up just from scanning the passport. The officer can ask as little or as much as he/she deems fit, sometimes they ask for a lot of information and sometimes they ask for very little."