Nikita is upset that score higher on the act that she did she just says start telling people that she saw me go back and fill in the answers on the test after time was called making him out to be a cheater does the vet have a legal case against nikita?

Nikita is the only witness to see you doing it but she made it up

To prove your innocence you would have to been with other people they would serve as witness saying you didn't do it even when you know you didn't  in order to prove your innocence.

I'm not sure if it answers your question

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serve the people! ,” smoothly translated by julia lovell, offers an initial sample of yan lianke’s writing to an english-speaking audience. a bluntly drawn, mildly erotic fable, it teases mao zedong by poking fun at a true believer who obeys the chairman’s precepts too literally. to a western sensibility, the broad strokes of yan lianke’s humor would seem to pose little risk of inciting rebellion, whether of the flesh or of the body politic. but then, part of the book’s attraction is that it doesn’t have a western sensibility. it lets the reader see — or rather, intuit — what jokes chinese officials don’t consider funny, and how very little it takes for a writer to be branded an incendiary in 21st-century china, more than three decades after the death of mao, a decade after the death of deng xiaoping and seven years since china entered the world trade organization, a move that would seem to signal a willingness (however wary) to mingle with the rest of the world.