Ground is Ground the World Around?

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I found the missing device today. It was sitting in plain sight on the 'instrument panel' of the stationary bike. Soon as I saw it there I remembered putting it there. Oh well... guess age is catching up with me.

Bought a cheap VOM (tap) from Sears today, in order to investigate my suspicion that the 'ground' on the 'Faraday screen' is not really ground. Sure enough: the resistance between 'ground' on the bathroom tub water spigot and the the rest of the piping was very high if not 'infinite,' and I had 'grounded' the screen on the spigot. I have since removed that ground wire and installed a somewhat more sophisticated 'ground' (which will remain for the moment undescribed). This one should work. If not, there are other options.