Someone posted something the other day about this. Apparently some guy staged his suicide to look like a murder by tying a gun to a helium balloon and shooting himself. The gun floated off and was never seen again.
The CO method of coals in a tent or sealed space seems to always be reported as an accident, might want to look into that. Camping trip gone wrong kind of thing.
I think some of the inert gas ones are undetectable too, but you'd need someone to remove and hide the equipment afterwards.
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