Electrical Outlets Upside Down? Code?
It has never made sense to me that the probability of something conductive landing on the blades was high enough to be detectable. Of course it's not that hard to do it however the inspector wants.
One problem with that is reading a KilloWatt meter.
European outlets don't have that problem. The pins are insulated halfway such that the tips don't make contact until they're completely inside. Ground is top AND bottom IIRC, and pins side by side.
I think the real issue, not yet mentioned, is that a child can plug in a cord with his/her fingers on the blade. That is FAR more likely than dropping a paperclip on it.