Ractopamine-Tainted Meat: About 45 percent of U.S. pigs, 30 percent of cattle and an unknown percentage of turkeys are plumped with the asthma drug ractopamine before slaughter. Up to 20 percent of ractopamine is still there when you buy it. Some 160 countries across Europe, Russia, mainland China and Republic of China (Taiwan) have banned the sale of ractopamine-laced meats. U.S. meats aren’t even tested for it.