The sheriff's department said the results from the hair sample were verified in early June. "I know that there was blood at the scene and so that was also part of the processing of the scene," Nanos said. Officials did not confirm, however, any details about that sample or whether it was the hair sample in question. Security video from Nancy Guthrie's home showed a suspect at her front door in the early morning hours of Feb. 1. "The bottom line here is this: We know more than you will ever know, because that's how investigations work," he said.