Mexico joined Canada in contesting a new U.S. law on country-of-origin labeling (COOL) for fresh beef and pork. The complaint, which Mexico filed with the World Trade Organization (WTO) on Dec. 18, claims that the U.S. regulations discriminate against Canadian and Mexican agricultural exporters. According to a WTO official, the organization received Mexico’s official complaint, starting a 60-day consultation period between Mexican and U.S. authorities. Afterward, Mexico can ask the WTO to set up an investigative panel.