Justice R Mala dismissed the petition filed by the father of Saranya, student of SVS Naturopathy and Yoga Medical Sciences College, who sought a second post-mortem.
The three students had allegedly committed suicide by jumping into a farm well as they were unable to bear "harassment" by the management which was accused of demanding "exorbitant" fees.
The court had last month allowed the plea of the father of another student, Monisha, seeking fresh post-mortem on her body, as he expressed doubts over the college's claim that the students committed suicide.
As all internal parts of Saranya were intact, a second post mortem of her body would establish the real cause of death, he contended.
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Rejecting the arugments, the judge pointed out that internal body parts of Monisha had been removed and sent for forensic and chemical analysis and the report was awaited.
Another post mortem on Saranya's body could not be ordered merely because internal parts of Monisha had been removed, she said.
The state CB-CID, investigating the case, had yesterday submitted in the court that the report of the autopsy done on Saranya's body showed the death was not due to drowning.