“Squealer” (*1/2 out of four) was a squalid serial-killer melodrama about a world-weary cop (Tyrese Gibson) and one of his partners (Wes Chatham) who team up with a hard-nosed social worker (Danielle Burgio) to try to track down a vicious murderer (Ronnie Gene Blevins) who also works as a farmer. Ugly and unpleasant, to say the least, as film is a lurid collection of low-lifes and people you never care to come across again. Gibson is simply killing time between “Fast And Furious” entries and is wasted but Blevins is well-cast as the butcher farmer.