CrossRoads:
I've heard of this technique whereby audio goes in one ear and out the other ...Otherwise, I don't know of any nonlethal techniques that don't take advantage of moisture on the skin for conducting
So the question is not about audio 
but about sending serial data through the body...
As I said my knowledge about his is very low, that is why I'm asking you guys, to get a better understanding of this...point me in the right directions