Raja testified last week that VX nerve agent was found on the women's clothing as well as Huong's fingernail clippings.
On March 1, the duo was charged at the Sepang magistrate's court - along with four others who are still at large - with murdering 45-year-old "Kim Chol", who was later established to be Jong-nam, the estranged half-brother of North Korean leader Kim Jong-un.
The trial of two women accused of killing the estranged half brother of North Korea's leader enters its second week with the court moving temporarily to a high-security laboratory to view evidence contaminated with VX nerve agent.
The murder charge under Section 302 of the Penal Code carries the mandatory death sentence upon conviction.
VX is banned by an global treaty as a weapon of mass destruction but is believed to be part of North Korea's chemical weapons arsenal. It was not removed from the bags, but the judge and court officials wore surgical masks and gloves as a safety precaution.
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Prosecutors also Wednesday sought to show VX was the sole cause of death. He also testified Kim Jong Nam had six different medications in his system, one a common Viagra heart-condition treatment, but no indications of a heart attack when he examined Kim's body. Huong was seen on airport surveillance videos wearing a sweater emblazoned with big black letters reading "LOL", the acronym for "laughing out loud".
Raja testified that VX can be safely removed from the palm of a hand by scrubbing it with water within 15 minutes of exposure, in a possible explanation of why the two women didn't show any symptoms of poisoning.
Traces of the nerve agent, which was used to kill Kim Jong Nam at an airport in Kuala Lumpur, had been found on the clothing of the two women accused of the murder, a Malaysian court heard last week.
Raja, the eighth witness to take the stand, is to be cross-examined by defense lawyers on Monday after the lab visit. He concluded in his autopsy report that Kim died of "acute VX poisoning". Mohamad Shah Mahmood testified that the fastest absorption would have been through the eye mucus and that once VX entered the bloodstream, "there is a very slim chance of survival". "They must have other stronger evidence", he said.
"It's no surprise", said Hisyam, Huong's lawyer.
Gooi Soon Seong, the lawyer for Aisyah, has said the detection of VX on the women is not enough to convict them. "We know their (prosecution) narration; we know the evidence that they have".
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