Share this article Despite Subway denying claims that its Tuna Sub does “not contain tuna or have any ingredient that constitutes tuna,” many are still wondering if there is any legitimacy in the lawsuit the chain is now facing. Looking to get to the bottom of the allegations, INSIDE EDITION launched its own investigation into the claims two California customers took to the U.S. District Court for the Northern District of California. The newsmagazine outlet’s Investigative Unit acquired samples from Tuna Salads from three locations in New York for advanced DNA testing. INSIDE EDITION also spoke to employees about the tuna controversy, getting a look at the actual packaging of Subway’s tuna where the ingredients read: tuna, water and salt.