Kuala Lumpur Hospital Forensics Department head tells court no DNA samples obtained from Kim Jong Nam's son or other family members.
She said blood tests on the two women accused of murdering Kim showed normal enzyme levels, but this may not conclusively show they were not exposed to VX because the women may have been in contact with a low concentration level or have decontaminated themselves by washing their hands with soap or taking an antidote.
Jong-nam, the half brother of North Korean leader Kim Jong-un, was travelling under the alias of Kim Chol.
Monday's court session was primarily a reconstruction of Kim Jong Nam's final moments at the airport.
Two suspects - Siti Aisyah from Indonesia and Vietnamese Doan Thi Huong - have been charged with murder and stand to face the mandatory death sentence if found guilty.
In court in Shah Alam, near Kuala Lumpur, Malaysian government pathologist Mohamad Shah Mahmood said VX was found on Mr Kim's face and eyes, as well as in his blood, urine, clothing and bag.
Prosecutors also sought Wednesday to show VX was the sole cause of death.
A Malaysian government pathologist testified Tuesday at the trial of two women accused of killing the estranged half brother of North Korea's leader that the banned VX nerve agent caused his death. Mohamad Shah said toxicology tests found six types of drugs in Kim's blood that are used to treat diabetes, hypertension and gout. The passport used Kim's pseudonym, Kim Chol.
To a question by lawyer Gooi Soon Seng, Shah said he could not ascertain if Kim Chol was poisoned before arriving at klia2.
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It said a chemical analysis detected VX as well as VX precursors and by-products on Kim's body and clothing and luggage.
Mohamad Shah said his conclusion that Kim died of "acute VX poisoning" was based on a chemist report of the presence of VX and the swiftness of death.
He said the individual poisoned with the nerve agent would have a very slim chance of survival.
Earlier, Shah had said the VX nerve agent might have entered the body through the eyes.
The judge earlier in the day upheld his ruling that sections of the post-mortem report be removed that defense lawyers said were hearsay or unproven.
FILE - A reporter holds up a local newspaper during his report in front of the morgue at Kuala Lumpur General Hospital where Kim Jong Nam';s body is held for autopsy in Malaysia, Feb. 18, 2017.
"There are two reasons (why qualitative data is enough in VX case), the first being that VX nerve agent is not available naturally, and secondly, VX (was made) only for one use, which is as a chemical weapon listed under the Chemical Weapons Convention 1997 list".
He said he had mistakenly reported that Kim was South Korean because he had misidentified his passport, issued under North Korea's formal name, the Democratic People's Republic of Korea.