All potential immigrants to Canada must also undergo a background clearance to weed out those who have been or are involved in espionage, subversion or terrorism. This is to ensure that the safety and order of Canadian society are maintained and protected. Such security screening decisions are made based on information from every available source, which is then carefully weighed to determine whether an applicant is likely to threaten the internal security of Canada. When there is an indication of security concerns an interview will be scheduled to discuss these findings with the applicant. Anyone who poses such a threat must necessarily be prevented from entering Canada.

Please note that there is a clear distinction between the police clearance certificate, which the applicant is required to obtain, and the background clearance, in which the applicant for the most part is not actively involved.

The issue of your illegal entry could potentially be construed as an issue relating to the provisions of criminality, but would not be expected to affect the background clearance.