In a lot of cases
Someone who failed a test might be leaving out a few other things or perhaps there were other areas of "FAIL" that they did not get to know about.
Point stands, if you manage to do something dangerous, too bad-FAIL.
Put yourself in their shoes and imagine what happens if they pass someone who's NOT meant to pass. A while later they die in a horrific airplane accident. Who will they be looking at first?
Think a bit harder about an EXAMINERS responsability!
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