Sex-for-grades trial: Law professor "making a mockery of the legal process", said prosecution

Law professor Tey Tsun Hang, 41, was "making a mockery of the process" and "running rings around this system", said Deputy Public Prosecutor Andre Jumabhoy in the sex-for-grades corruption trial on Thursday.

In his re-examination, Tey, a suspended associate professor from National University of Singapore, had applied to admit as evidence six cautioned statements he recorded last July. This was in relation to his six charges of corruptly obtaining sex and gifts from former student Darinne Ko, 23.

He claimed the cautioned statement contains details he had brought up in court this week but failed to put to Corrupt Practices Investigation Bureau (CPIB) officers when they took the witness box in January, and were central to the rebuttal of assertions made by the prosecution that he was "making things up" along the way.

But Mr Jumabhoy countered that admitting the six cautioned statements at this stage would defeat the purpose of a "trial within a trial", which is underway to determine that the statements he made to CPIB were voluntary and can be admitted in court as evidence. This was because the statements "impinged on" the content of six main statements he had recorded, and may prejudice the court's mind.

"If he chooses as a matter of common sense not to put certain aspects, he doesn't get a second bite to say, well, hang on a second, six months later I have got a document that says that I did do that," Mr Jumabhoy said. "The danger in this course is that it's never going to end because if he adduced new evidence in the course of re-examination ... he may well allude to another document."

Chief District Judge Tan Siong Thye ruled that the statements be admitted. He said: "It is his entitlement. It is for the court to determine at the end of it whether those statements - the six statements - were made voluntarily."

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