Nearly 30 years after 6-year-old JonBenét Ramsey was brutally killed, her father still believes police have not exhausted all avenues when it comes to solving her murder. In a sneak peek for the Monday, September 9, installment of True Crime News, John Ramsey, 80, alleged investigators have not tested the DNA on the murder weapon. “I don’t know why they didn’t test it in the beginning. To my knowledge it still hasn’t been tested,” he revealed in the clip. “If they’re testing it and just not telling me, that’s great, but I have no reason to believe that.” AsOK! previously reported, JonBenét was…