This is what my butcher told me. Any meat that is past the use by date will most likely be perfectly fine for several days after. Provided it was stored and handled properly. He went on to explain how to check it to be sure. First check is the look check, Look it over closely, look for odd/off colors. Second test is the smell test, smell it in several places, there should be no off odors. Third test is the feel test, the meat should feel slightly firm not mushy, and have no slimy feel. If the meat passes all 3 tests it is most likely fine. HE also added that any meat that is past the use by date should be cooked to 165 or above, for further safety.