IRB ADMISSIBILITY HEARING LAWYER
If you're already in Canada or arrive at a port of entry and the Canada Border Services Agency claims you are "inadmissible" for some reason, you have the right to a hearing before the Immigration & Refugee Board of Canada. But you've only got one shot to make a good impression.
While the hearing is a bit less formal than a court proceeding, rules of evidence and procedure still apply, documents need to be presented and challenged, and live witnesses may testify and be cross-examined. It's highly advisable to use an immigration lawyer for that process.