The CBSA manages trade compliance with the Tariff Classification, Valuation, and Origin programs using the following two post-release verification processes: (1.) Random verifications and, (2.) Verification priorities.
Random verifications are intended to encourage voluntary compliance and measure compliance rates and revenue loss based upon Risk & Revenue assessments. Targeted verification priorities are determined through a risk-based, evergreen process, meaning that new targets are added throughout the year. Verification priorities may also be carried over from previous years. The current verification priorities include footwear and apparel.
Source: http://cscb.ca/sites/cscb.ca/files/uploads/Trade_Compliance_Verifications-July_2014.pdf