A disgusted Cornell University student ratted on his accused rapist frat bros by turning over a key piece of evidence — a SnapChat message proclaiming “free p–sy’’ in the form of the allegedly incapacitated student — to the victim, the accuser’s lawyer told The Post on Monday.

Lawyer Thomas Giuffra also revealed how Cornell Police and the local upstate district attorney allegedly failed his client in nailing her assailants — and how the school in Ithaca, New York, essentially forced the 20-year-old victim to remain enrolled on the same campus as her attackers by refusing to refund her tuition so she could study somewhere else.

Giuffra said the…

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