The police officer behind the arrest of a Perth man facing a possible death sentence in Malaysia has admitted to selling the drugs, which he allegedly obtained from the accused, to his informant.

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The police officer behind the arrest of a Perth man facing a possible death sentence in Malaysia has admitted to selling the drugs, which he allegedly obtained from the accused, to his informant.

Serious allegations of corruption have been levelled in court against Inspector Luther Nurjib, the undercover police officer who arrested Perth man Dominic Bird, 32, in March for allegedly supplying 167 grams of methamphetamine.

Bird faces a mandatory death penalty if convicted.

Insp Nurjib on Friday admitted he had taken RM1200 ($A375) from an informant which he used to allegedly buy a five gram sample of methamphetamine from Bird.

He then gave the drugs to the informant.

Insp Nurjib did not report the transaction to his superiors.

Asked by Bird’s lawyer, Muhammad Shafee, if the informant had played a “key role” in the alleged drug deal, the police officer replied: “Correct.”

“When you took the RM1200, did the informer know you would give him the five grams?” Mr Shafee asked.

Insp Nurjib replied: “Correct.”

“You confirm on this day you bought the drugs and sold them to the informer?” Mr Shafee asked.

Inspector Nurjib again replied: “Correct.”

Earlier in the Kuala Lumpur High Court trial, questions were also raised about the lengths the undercover officer went to in pressuring Bird to supply the drugs.

Insp Nurjib also admitted on Friday to having faced disciplinary action in the past for having stolen a Rolex watch from a suspect in another case.

The revelations are likely to have implications for Bird’s chances of winning an acquittal, with Mr Shafee later saying Insp Nurjib’s credibility had been destroyed.

“The way (the police) behave with informants is so loose,” Mr Shafee said outside the court.

“He took the money from the informer who may be a drug trafficker himself.”

“So a police officer is dealing with a drug trafficker in order, according to him, to fix another drug trafficker.”

Mr Shafee said there were also now questions over the possibility of more widespread corruption in certain sectors of the police force.

“It’s total abuse in the worst form in an anti-narcotic unit,” he said.

The trial was adjourned until February 13.