Endangered Species (1982)

Based on a true story, Endangered Species stars Robert Urich and JoBeth Williams. Urich plays vacationing ex-cop Ruben Castle, while Williams portrays Harriet Purdue, a small-town sheriff. Intrigued by Purdue's investigation of a rash of cattle mutilations, Castle begins following the evidence trail himself. What has been attributed to a religious cult or extraterrestrials by the locals turns out to be a covert operation conducted by a corrupt cartel. ~ Hal Erickson, Rovi

It is avaliable on the internet if you look.