Talk to the pozole man. With enough acid I expect you could completely liquefy a body.
Barring that, cremation followed by fine milling of the remaining bone fragments out to work pretty good. Scatter the finely milled ashes widely enough, and they’ll be indistinguishable from the local soil.
How long until the CSI team comes on the scene? A couple days or a couple years? I have 420 acres of woodlands and farmland and access to a backhoe. Come to think of it I think I know where I could get an auger/drill that would work off my cousin’s tractor. Not that I’ve thought this through or anything.
If you’re interested in doing it chemically, my advice would be sulfuric acid and hydrogen peroxide.
You could get some steaks & some chemicals and try various combinations. You might have some luck with a protease, for example. But, if you’re constrained by time or have no patience for science, just stick with the above & I think you’ll make enough smelly goo to make you think twice about doing it again.
The best bet would be to avoid examination in the first place. A good hiding place and tight lips kept many a mafia slaying out of the papers.
Okay… Then I’d go for burning. Pulverise the ashes and repeat. You’ll end up with an anonymous gray powder. No DNA evidence remaining, and the bones are only dust. Since I used a lot of wood for the fire, you can’t even test the chemical composition of the ashes for “animal” chemical make-up. (If that’s a thing, I’ll burn a lot of plastic junk in the same fire.)
Chopping into little bits and feeding 'em to the pigs is also a goodie. Rinse the pig-poop and cycle it back through the pigs again with their feed. Before very long, any “humanity” is totally gone from the results.
He almost got rid of the body of his 19-year-old victim completely, by burning it up in a fire at his northwoods property… All that was left were some bone fragments (but so badly burned that DNA couldn’t link them to the victim, a part of a single tooth, also too burned for DNA links. If he had burned it a bit more, or pulverized the bones and reburned them, and sifted the ashes to find teeth, it would have been completely gone.
You got to starve the pigs for a few days, then the sight of a chopped-up body will look like curry to a pisshead. You gotta shave the heads of your victims, and pull the teeth out for the sake of the piggies’ digestion. You could do this afterwards, of course, but you don’t want to go sievin’ through pig shit, now do you? They will go through bone like butter. You need at least sixteen pigs to finish the job in one sitting, so be wary of any man who keeps a pig farm. They will go through a body that weighs 200 pounds in about eight minutes. That means that a single pig can consume two pounds of uncooked flesh every minute. Hence the expression, “as greedy as a pig.”
Cut the hair into half-inch lengths, and smash the teeth to powder. Then, not only feed it to the pigs, but run it through 'em a second and third time, to make sure of the hair.
(Or just burn the hair separately.)
Too few people ever think of smashing the teeth and bones. There was a Sherlock Holmes story where Watson recognized one end of a human femur. Half an hour’s light labor over an anvil would have put an end to that once and for all.
Getting rid of a body does not mean you will get away with it,
The absence of certain activities from a deceased person will generally flag up some alarms, and the fact that online presence is increasing for most folks means that unusual absence is becoming more noticeable.
Online presence also draws far more links that previously too. The killer is very highly likely to have some connection to the missing person, body not required