Hong Kong labour authorities are stepping up enforcement of a smoking ban at construction sites by testing drone technology designed to detect illegal smoking. Since the ban takes effect on July 17, officials say they have inspected nearly 1,400 construction sites. Authorities have issued 39 fixed-penalty notices and 11 improvement notices to contractors for violations. According to the Labour Department, assistant commissioner Wan Chi-ping says testing is underway on an infrared thermal-imaging drone that can identify heat sources associated with smoking. The authorities are also considering adding artificial intelligence to help distinguish smoking activity, and exploring the use of AI-enabled facial recognition on drones to better identify offenders. The Labour Department says it is reviewing how drone-based monitoring could improve compliance and enforcement, while ongoing inspections and penalties continue under the existing ban rules. The current testing aims to determine the feasibility and effectiveness of using drone surveillance for detecting violations at construction sites.