Cops keep teargas chemicals a secretLocal | 20 Nov 2019 5:06 pm
The Food and Health Secretary Sophia Chan Siu-chee told lawmakers today that the manufacturing details and the chemical composition of tear gas can not be revealed as the police have decided that such information should be kept secret for operational purposes, RTHK reports.
Responding to a question about tear gas from Democratic Party's Helena Wong, the secretary said the police have been sourcing "safe and suitable equipment globally according to the esablished procedures.''
Chan also told Legco that there has been no evidence to suggest that the use of tear gas could produce dioxins, or cause dioxin poisoning.
Dioxin is a highly toxic chemical that could cause cancer.
"Given the short time of combustion of tear gas canister, any cyanide produced will be quickly dispersed in the air," Chan said.
She also said after large scale events, the Food and Environmental Hygiene Department provides workers to clean up areas affected. The Environmental and Protection Department had not detected any abnormalities in the air or water quality, Chan said.