Supreme Court upholds California's humane treatment law for pigs.

The US Supreme Court has upheld California's Proposition 12, a ban on the sale of pork from pigs housed in cages or crowded group pens that prevent them from turning around freely. The ruling could have a major impact on thousands of farmers, millions of pregnant pigs, and the prices Americans pay at the grocery store for one of the country's most popular meats. The decision affirms rulings of two lower courts that found the out-of-state pork producers had failed to state a valid claim against California as a matter of law.