It's well-known that airport security is stricter (and often slower) than it used to be. Hard to believe that there was a day when we could all carry toothpaste and lipstick on board the plane!
The security screening at Canadian airports is similar to that in the U.S.A.
Passing through the Pre-Board Screening should be the same fine experience whether you have special needs or not. However, if you know what to expect before you go, you may avoid some unexpected problems.
This webpage from the Canadian Air Transport Security Authority covers a wide selection of special needs. Some of the headings are:
The website tells you in more detail how to deal with pre-board screening in any of these cases. The main message is, don't wait until you get to the airport. Think about whether any of the special needs cover your situation, and do as much as you can in advance.
If you know of a useful summary like this for the U.S.A. or any other country, please, send it along.