Test by murder suspect backedLocal | Staff reporter 12 Sep 2018
An obstetrics expert said a carbon monoxide experiment conducted by a murder suspect was an innovative and well-planned one.
Wang Chi-chiu, the division head of the Chinese University of Hong Kong's department of obstetrics and gynecology, testified for the defense at the trial of Khaw Kim-sun, 53.
Khaw has pleaded not guilty to murdering his wife, Wong Siew-fing, 47, and daughter, Lily Khaw Li-ling, 16, by placing a yoga ball filled with carbon monoxide inside their car on May 22, 2015. The associate professor at the Chinese University's department of anesthesia and intensive care, who is on trial in the High Court, conducted carbon monoxide experiments on rabbits to see if oxygen would aid the animals poisoned by the gas.
Wang said he thought Khaw's experiment were useful clinically and scientifically.
Wong said The Lancet published a report saying using highly concentrated oxygen to treat critically ill patients may increase their death rate. Khaw had attempted an experiment back in 2015, where he used less concentrated oxygen to treat patients, Wang said.
Instead of using 100 percent oxygen, Khaw used 60 percent oxygen. The professor also chose not to let the rabbits inhale the gas and instead injected the carbon monoxide into their blood before injecting the blood back into their bodies.
Wang reiterated that Khaw's experiment did have its merits. The defense has summoned its last witness.
The hearing continues today.