[newzjunkey]

Wackman knew that it was purchased from a company, but that didn't affect his grading, he said. He had concrete reasons to mark it down...

As the phrase goes, "I was born at night but not last night."

There's a reason double-blind testing is a pillar of scientific rigor. He knew it was purchased making him tainted. His grading is rendered meaningless by the foreknowledge. His "concrete reasons" are irrelevant.

[ctdonath2]

Not if there is objective error.

If the question was “What is 2+2=?” and you KNOW the answer was purchased (say, because the submission includes the URL TestAnswersFor25Bucks.com/What_is_2+2=?), if the answer is 3 then regardless of obvious bias you can still give an objective grade of 0 for concrete reasons.

(Not joking about the URL.)