<p>I think that most students don’t report it. Except perhaps at colleges with honor codes, they are under no obligation to do so. They’re also under no obligation to go over the corrected test in detail, which is the only way in which they would discover the discrepancy. So it’s not like they’re going to get in trouble for not reporting it.</p>
<p>Are they doing the ideal thing, ethically? No. But we live in the real world.</p>