MALAD, Idaho (AP) — A southeastern Idaho sheriff says obstacles to solving a month-old triple killing include the secretive world of illegal dog fighting. but Oneida County Sheriff Jeff Semrad says the investigation is moving forward in solving the case involving a dogfighting ring and marijuana growing operation at an eastern Idaho residence where two men and a woman were shot and killed.  The bodies of 62-year-old Brent Christensen, 32-year-old Trent Christensen, and 27-year-old Yavette Carter were discovered at the property outside Holbrook on April 5. Two children, both unharmed, were also found and have been placed with family.  Semrad says evidence indicates the victims had some type of relationship with the person who shot them.