I think at my school I was indirectly accused of cheating, I was bullied and treated like dirt so got average/low grades but every time I decided to study hard I got good grades.
The only teacher I outright remember acusing me was this one who just graduated uni and had been working at school less than a year but he was the sort to accuse people of anything as he was snooty to kids from council estates, he accused me of being a smoker and even now I dont, he accused me of forging parents signature as my mums is messy (she is dyslexic) though the other teachers didnt even care and even though I left school with excellent grades in all but 1 class (geography my weak point) to the point I got 100% in many mocks when I asked for a ucas reference I was called slow and in need of learning support (I am autistic but school refused to diagnose and accept it just saying I was from a poor family so lazy yes they actually said that) even though I only got learning support in first 2 years due to bullying and turned it down after that.