found no cocaine on shannan's hair but they didn't do more drug testing according to the family.would be maybe, routine? and do the parents have a beef that's legitimate that not enough has been done? >> well to the first part of the question, routine would be, there's a almost a chinese menu of different controlled substances that can be tested for in the hair specifically cocaine is one and that's the one they did but there are others as well. there is heroin, marijuana, different opiates and chris tell methaphetamine. i concur with the parent's beef there should be broader controlled inquiry of the controlled substances in her body at the time. harris: as we look at this case we find out all this started and they were looking for shannan gilbert and came across all the remains in that same location. now we don't know how she died. doctor, from what you're saying we may never know. gentlemen, thank you. >> thank you, harris. harris: you want to lower your risk for developing alzheimer's disease? change your diet. we'll tell you which foods can do wonders in keeping your mind sh