This video tells how many countries around the world prohibit wearing a mask at public events by law and why they do so.
"If you knew that you could be easily identified, do you think you would be as inclined to commit that act of violence or commit that crime?" a US police chief asks in the video.
"The purpose of an anti-mask law is to prevent crime and deter would-be offenders to think twice about the legal consequences they will face," founding president of the Small and Medium Law Firms Association of Hong Kong stresses.
Watch the video to learn the whole picture about anti-mask laws.
(Video source: China Daily; Compiled by Xu Zheqi)