Many food industry quality control practices are effectively determined by consumer demand rather than the FDA/USDA. It's often that, as a manufacturer, your customer audit will be more intensive than the government one. The feds just don't have enough auditors to really keep a close look on anything but the most "at risk" plants, so the food industry is basically watching itself in a circular manner. Retail food establishments are auditing their suppliers, who are auditing their suppliers, and so on.