J’ai potassé un peu sur internet :
"Background checks are used to verify information regarding someone’s criminal record, education, and employment history.
There are three main steps involved in a background check:
Criminal History Check – This stage of the background check confirms any past criminal activity, from DUIs to any registration in a criminal organization.
Security Screening – This stage assesses your risk to the health and safety of Canada and Canadians, completed by CBSA, CSIS, and IRCC.
Information Sharing – At this stage, the various authorities share their information with each other and the IRCC makes a final decision regarding your application."
Grosso modo il y a en plus d’ircc une enquête de l’agence des services frontaliers + des services de renseignement. Sur redit on voit des demandes bloquées à ce stade pendant 6 à 8 mois ça fait peur