I'd bet my life every single thing found was photographed immediately and exactly as found.
I also bet the "improvisation" done was investigators determining whether the duct tape could have been placed any other way in order to achieve the result that was found. They'd of course document any models to say "out of these 36 possibilities, the only way the mandible would still be attached to the skull would be if x y z"
Wasn't the duct tape removed by Dr. G. at the autopsy? Oh, I forgot. She is guilty of spoilation of evidence and practices junk science.