If you have an extremely good reason why you need to enter Canada, you can apply for a TRP (Temporary Residence Permit)
 Extremely good reason?now i cant see that quote on the cic web site,or do you know better?
 and if you do whats a extremely good reason?where would  extremely good reasons start?
 and have you any qualifications in this field?are you a imigration officer?lawyer?police officer?