maybe they were trying to lower grades across the board.

[Actually, he hasn't heard of a teacher with this particular problem, but it's not like he discusses phone health or strange electronic snafus with his teachers regularly. He'll quietly go to them for help with his studies, or if there's a real issue with a classmate, but he keeps to himself otherwise.]

if half the class turns in doctor's notes...

[Among the students, though, there's been quite a few issues. Hey, desperate times, desperate measures?]