The upcoming review of the Canada-US-Mexico free trade agreement, which reduces or eliminates trade barriers, has some dairy producers worried. Dairy farmers want Canada to protect the supply management system, a Canadian policy that prevents shortages and keeps underpriced imports from being dumped into our market. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX