He had buried a QPS lab, hadn't turned it in. Note from the teacher written on Tuesday, but mailed Friday, showed up on Saturday. A missing lab == 'D', which would be BAD.

He claimed nothing missing, would resolve it all on Tuesday. Told us to drop it. NEVER!

I email the teacher. Her reponse was no lab was needed, he had turned it in on Friday, VERY LATE, but she was going to accept it since he was such a good student, typically.

So I grill him about it. He responds, "Oh, that?, That was some other homework I turned in. I didn't realize it was the IMPORTANT lab."

So I respond to the teacher, is this reasonable not to know? Also, anything else outstanding?

She replies: Not a chance, she had several meetings with him about it.

He then counters, "Yeah, so what. She's going to accept it so my grade is fine"

The good kid just got caught in a pattern of lying.
Damn.
At what point can I trust ever again?

While I'm not sure the twitches are cuased by the internal stress, it is a strong coincidence.