In the latest TV ratings, CBS’ Undercover Boss returned from its four-week, dodge-the-Olympics break to 3.6 million total viewers and a 0.4 demo rating, ticking up from its last fresh airing. Magnum P.I. (5 mil/0.4) and Blue Bloods (6 mil/0.4) both dipped, however — though the latter still copped Friday’s biggest audience. Over on ABC, […]