Supermarket sushi rolls may be deeply discounted from restaurant prices, but does the quality of the fish present a gamble to your GI tract? Stephen's leery about eating days-old sushi from a quality control standpoint, but James believes that strict FDA standards have all but weeded out food poisoning from American prepared foods. Later, our hosts predict whether anyone would be able to tell the difference between a sushi roll containing sushi-grade fish and one containing salmon bought from the supermarket seafood counter.