Let's see, how much trouble is it to find a paper clip to insert in an outlet? Or take the outlet cover off to fool around inside the box?

We can't protect against everything.

As for the ground...since the ground rod is supposed to be all the way into the ground, we may not be able to see the top, or the clamp, or the ground wire attachment. If I can't see the ground rod, I will sometimes give the ground wire a yank and see if it comes out of the ground.