I was sent to detention today because apparently I physically hurt some girl I didn't even lay a finger on. This was my first time ever in detention. Apparently the incident was that I tripped her and she fell over against the wall and now has a "twisted back" when I know I didn't do any of this.

I was across the entire hallway of my school when this happened, I was nowhere near her, neither did I hear her fall. When someone came to pick her up she said "That kid did it! He tripped me!"

This isn't the only time this has happened, I was sitting down for a seat at lunch when she ran at me trying to take the seat I was about to sit down in (none of her friends were sitting there nor any of her peers that would at least like her.) and knocked me out of my seat, and I feel on the floor, while she's in the chair. Apparently "He tried to punch me while I was about to take this seat and now my stomach hurts!" This time I was issued with a warning.

Reddit, i'm looking to go to a good school and have a good education, but i'm afraid that another stunt like this and I will get expelled (They almost have a 0 tolerance policy against this) What can I do to save my ass?