A study by USA Today found that the U.S. government's school lunch program, via the USDA, handed schools millions of pounds of beef and chicken that wouldn't even clear the standards of fast food restaurants like Jack in the Box and KFC.
"Each year the USDA purchases more than $1 billion in cheap commodities as part of the federal contribution to the school lunch program. Regretfully, the USDA is driven by two factors: get the food for the lowest price and prop up prices for commodities that are in oversupply or are unattractive to business purchases. Not quality. In 2009 alone, the USDA purchased more than $151 million of commodity pork to prop up failing industrial pork producers."-David Murphy (Johnny Can You Spell Salmonella? U.S. School Lunch vs. Jack in the Box)
Making a lunch for your child to take with them to school is a better idea (they shouldn't be in school in the first place, but that's another story).