WAY too much thought about gfci and shocks. I firmly believe in them, but the other day I installed a gfci outlet in a bathroom and could Not make it trip using my wiggy tester to the hot water, coldwater or water spout nor to the drain and pop up. I ran a wire to the heat register and could not get a ground. (the ducting was not connected thru the floor) only after I ran a cord (3 wire) from another outlet could I get a ground that would trip the new outlet/curcuit. With all the plastic plumbing today, the shock threat is way down. Not to be confused with an rv and someone standing on the ground and touching frame or alum skin.