The Joe’s Crab Shack menu states that no trans fats are used, but the CSPI claims that some locations are using margarine that contains high amounts of the controversial ingredient.Yesterday, restaurant chain Joe’s Crab Shack was called out by the Center for Science in the Public Interest for continuing to use margarine with a high level of trans fat, in spite of claims made on the eatery’s menu that Joe’s doesn’t use the controversial oils.