Subway is chewed out after lab tests find no tuna DNA in its tuna sandwiches

>A Subway spokesperson told MarketWatch via email that DNA testing is an unreliable way to identify denatured proteins — or proteins whose characteristic properties change due to heat or acidity, such as the way Subway’s tuna was cooked before it was served on a sandwich, and then later tested by the Times. I've worked at Subway. It comes in a can, precooked. That means that it comes in a standard form that can be measured. So, no, no tuna involved.