Forensic Files had an astounding program about a guy who killed a gal back in the 60s (I think). He buried her in his back yard and poured concrete over her. His mix was pretty sloppy and, get this, the forensics people poured some stuff into the opened part of the concrete and got a death mask of the woman, which they showed on TV and which resulted in her identification.
Not only that, they got FINGERPRINTS out of the concrete which backed up their identification. Those guys should have gotten some kind of award for that bit of work. Oh yeah, they tracked down the murderer, only to find him in a home for retards. He dove/fell out of a three-story window and landed on his head. Major brain damage that left him a veggie. Cops said it was poetic justice, which was true, for our goofy legal system would have given him something like 20 years, at worst, which meant out in five or six with "good behaviour".
Appears that you and I have similar tastes in TV programming, Oatka. I saw the same Forensic Files offering not long ago.