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more than 50 years ago I had a trap line in the city of Los Angeles, I was 14 or so. We used to trap coyotes, foxes, bobcats and skin the critters (we really played up the Jeremiah Johnson deal) Our back yard was tough to dig in but my 80 year old neighbors rose garden was nice and soft so I buried the carcasses there. One day there were 4 LAPD homicide detectives in her back yard examining what she had dug up. They were partially decomposed critters and the detectives said they didnt know what they were, but my Dad sure did and if I remember right it I got a very stern lecture. The case is probably still on file as an unsolved serial killer gone mad. To answer the question 6 months buried doesnt do it.
Burying a carcass substantially increases the amount of time it takes for it to decompose.