Investigation by the Colorado Bureau of Investigation

This chapter discusses the involvement of the Colorado Bureau of Investigation (CBI) in the cattle mutilation cases of the 1970s. The CBI conducted a 19-month investigation, looking at over 200 reported mutilations and necropsies of 19 carcasses. While some cases were ruled to have possibly had cuts made by a sharp object post-mortem, all signs still pointed to natural causes of death. The CBI even offered a reward for information and set up a witness protection program, but the case was eventually closed due to lack of apparent criminal activity.