Was a ‘Rambo’ Knife Used in the Murder of 4 University of Idaho Students?

Detectives were reportedly seen visiting sporting goods stores asking if they sold a 'Rambo'-styled knife. It’s in connection with the murder of four Idaho college students. The weapon has a seven-inch long steel blade that's serrated. The actual murder weapon has not been found. However, police were seen searching in dumpsters hoping to find it. Also, authorities revealed shocking information that two other roommates were inside the house when the students were murdered.