Wal-Mart's supplier, ag corporate giant Cargill (the country’s largest private company), doesn't; their beef nearly killed a 22-year old woman and left her paralyzed, says the NY Times. Cooking it well-done would not have prevented her near-fatal, possibly permanent injury.
Wal-Mart's 'Angus' beef was...
made from a mix of slaughterhouse trimmings and a mash-like product derived from scraps that were ground together at a plant in Wisconsin. The ingredients came from slaughterhouses in Nebraska, Texas and Uruguay, and from a South Dakota company that processes fatty trimmings and treats them with ammonia to kill bacteria.Cargill's 224 plants were inspected; USDA officials found serious problems at 55 plants (one-quarter!) failing to follow their own safety plans.
Object lesson: If you can't go to Costco and want ground beef, buy your beef whole and have it ground in the store while you wait, or buy beef labeled, “100% whole muscle means no trimmings.”