I once ran into construction power equipment which had been rewired by a grade school drop-out.
He used the color codes found in automobile circuits: black is ground, green is hot, white can be anything....
So it was necessary to re-wire every connection he'd touched.
Every now and then you'll read of some victim of this kind of thinking. About three years ago some non-electrician rewired the cord-cap to a power drill -- black as ground, of course. The fella fired it up while standing in a puddle -- and services were held shortly thereafter.
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I rather suspect that some of those walls will need to be opened up. The more you scare the inspector the more you may have to display.
Anyone who is so far off the rule book is most unlikely to strap properly. I'd want to meg every run -- what damage lies underneath.
