I believe that certain segments in Canada have made great noises against the current dispute mechanism  as it allows US companies to sue when Canada cheats on NAFTA. Unless the dispute mechanism continues to have teeth, politicians on both sides if the border will encourage cheating.   

Canada's Consumer Packaging  and Labelling Act  (R.S., 1985, c. C-38) is largely intended as an anti-trade device and little to do with the consumer.