Actually Canadian Customs inspectors have many roles at PIL. They are Customs officers, immigration officers and screen for other agencies such as Canadian Food Inspection Agency etc... The PIL officer is the one who usually does the referral and codes the card. Referral is also possible at other points in the system. Customs at Land Borders tried to have seperate lanes for Canadians but this largely failed as well you guessed it our foreign friends didn't usually pay much attention to which line they were using.