There are a number of tools that officers would use. If that individual had already been through a visa screening process overseas, that full visa file would be available to the officer at the port of entry for consultation, if needed, for an understanding of the decision-making. If it's an impromptu arrival at the port of entry, we would have already looked at the individual through an advanced passenger targeting process. If that individual was coming in by air, we would have cross-referenced any index or any indicator that would have been flagged against that individual, either through a lookout or through a target set against that individual if they were a known risk to Canada.
On October 24th, 2016. See this statement in context.