If
foul play is involved, the best way to dispose of a
human corpse would be
lye.
Lye is a substance also known as
sodium hydroxide (
chemical formula NaOH) and is used mainly in chemistry labs, and in the production of
soap.
The
soap-making (and corrosive) property of the chemical is what is most beneficial for our purposes.
Take the
corpse, place it in some large garbage bags, and transfer it to the trunk of your car. Then, drive the car to your house, and at night when your
neighbors won't see you, transfer the body to your
bathtub. Now take the body out of the
plastic bags, and strip it
naked. It would be a good idea to burn the bags, and the clothes. Cover the body with a whole bunch of lye, plug the tub, and fill with a small amount of warm water.
Less than a week later, pull the plug, and the body will be oh-so-much soap and hair. Now all your legal problems are over.
Disclaimer: Don't fucking do this! Seriously, don't! If you do, it's not my fucking problem or fault