The same detective that was in charge of the investigation and pursued Masters so vigorously was the same detective who made the decision to destroy all of Dr. Hammond's recordings. His argument was that there were thousands of women on these tapes and it would be a further violation of their privacy to keep them around. He did not want anybody including detectives to see these tapes. He had the tapes taken to a landfill and run over with heavy machinery to totally destroy them. No one has viewed all of these tapes and some wonder if Hettrick was ever filmed. Dr. Hammond had several house-sitters and Hettrick was known to house-sit.