[Slacker]

i wouldnt personally use this method...
entirely WAY too many possibilities for leaving evedince (shoe prints in blood, hair follicles, if victim scrathches you dna in nails, weapon disposal, blood on your personal clothes and tracked where you go etc etc)

i would never kill another person... but if it ever came down to "YOU OR ME" I would simply buy a throw away fire arm, discharge said fire arm, remove teeth and finger / toe nails of victim, dispose of carcas to a hog farm, dispose of teeth in lye or similar acidic materials...

no teeth / nails = no trace
only bone fragments (no teeth etc that hogs wont eat) come from hogs feces = no trace

[Zeus]

Maybe the guy is curious like what if one day he needs to know this information so he doesn't get caught killing someone. His intentions may be good now but years down the road...

[Esoterith]

You could make the motions for it just not actually do it.