Pretty sure I saw this on CSI.
When Mexican police found a body in the woods it was burned beyond recognition, its DNA too damaged to be used for identification. Luckily, investigators were able to extract DNA from elsewhere - the digestive systems of maggots that had been feeding on the body. This is the first time that human DNA from a maggot gut has been analysed in this way to successfully identify a victim in a legal case.
They do this on Bones all the time.
Similar techniques are studied at the University of Tennessee body farm:
http://www.vice.com/read/body-farm-643-v16n2
https://www.youtube.com/watch?v=FDU0X9VVQn4
"...and I will never stop screaming," said Jim's brain.
this works with zombies, too.
new punk band: "maggot gut "