I once fantasized about doing this to someone in a conventional manner, but lacked the criminal ethics and material requirements to carry it out. (In other words, I’m not that much of a scumbag, nor am I that inventive as to be able to carry off the smaller details).
What I call “The South Dakota Treatment”. Called as such because this is a neighboring state, but suitably distant, with large chunks of the state located quite some distance from the one and only interstate that crosses it. There are many other equally suitable places in the western US or in Canada, as you will see.
1> Render the person unconscious in a manner that cannot be detected by subsequent tests or examinations and in such a way as to not be seen or even noticed by the victim. You must also be able to remove the victim from the scene without being seen by others.
2> Transport the victim to a remote spot in northern South Dakota, at least 100 miles from I-90, at least 10 miles from the nearest town and not in sight of any residences.
3> Strip the victim naked. No clothing, no money, no ID. Pour a bottle of cheap liquor down their throat and all over them.
4> Dump the unconscious victim on the side of the road and depart with no witnesses. Leave no vehicle tracks.
5> Victim wakes up in the middle of nowhere, naked and with no ID or money, no freaking idea where they are and not in sight of any habitation. No idea what happened or how they got there. Will be picked up by the police immediately and asked to explain, which they can’t. Obviously, they got really, really drunk (the booze), but what transpired to lead them to that spot is a complete mystery. The victim has no memory of anything. There is no physical evidence.
6> Bonus points for leaving their clothing and ID in a completely different spot a similar distance in the opposite direction.
Now obviously, this would make national news, and the person would be considered mentally ill and hospitalized for quite some time.