I admit, I have tried to figure out hypothetically how someone could get away with murder, and I thought going to another state, or even going to Mexico or Canada and then killing a random person would be part of it, but even then, you would have to do it from a distance because you might leave DNA on the body (they might fight back for example, get a bit of your skin under their nails or something). That would probably involve shooting a gun. Which is loud.

Maybe if you found a way to poison someone without anyone seeing the both of you together…