They're not barred from the profession. There are trucking jobs within the US they can do. As far as going to the US from Canada, you'd have to blame the US on

They're not barred from the profession. There are trucking jobs within the US they can do. As far as going to the US from Canada, you'd have to blame the US on that one. People whose job requires international travel have always been expected to keep up to date regulations. Truckers were just an exception.