In 2025, the Food & Environmental Hygiene Department (FEHD) cracked a case of illegal goat slaughtering. The premises involved were located in a remote rural area and concealed from view. Accordingly, a key factor in foiling the perpetrators was the use of aerial intelligence.

Officers used drones to capture footage, then cross-referenced this with aerial photographs taken by the Lands Department. This allowed them to identify suspicious locations.

The FEHD outlined that using drones to collect evidence reduces the need for manned patrols, boosts efforts to combat illegal slaughtering activities, illegal meat distribution centres and unlicensed food premises, and improves staff safety.

Expanded capabilities

Explaining the limitations of traditional methods, Food & Environmental Hygiene Department Senior Superintendent (Operations) Lo Chi-man remarked: “Relying solely on manpower-based patrols, plain-clothes operatives could only conduct surveillance in the vicinity of the target premises. Operatives also faced significant safety risks such as potential violence, aggressive dogs and structural hazards.”

After the introduction of drones, however, intelligence can now be gathered at high altitude, adopting a bird’s eye view. This allows operatives to clearly map entry or exit points, personnel distribution, suspicious vehicle locations and escape routes in advance.

Smart inspections

Beyond intelligence gathering, the FEHD has been working with the Electrical & Mechanical Services Department since 2025 to study the feasibility of using drones to support street cleanliness inspections.

Under planned trials, drones will conduct automated aerial patrols along pre-set routes in order to detect accumulated rubbish, overflowing litter bins and damaged refuse collection facilities. The captured images will then be analysed using artificial intelligence, enabling the FEHD to arrange timely follow-up actions.

Food & Environmental Hygiene Department Senior Superintendent (Innovation & Technology) Kuan Man-hou highlighted that street cleaning inspections largely depend on frontline staff making in-person site visits. Officers are required to carry out visual checks and take photos to record conditions. However, some locations are remote and transport can be inconvenient, so the trips are often time-consuming.

With the automated inspection system, however, the FEHD will be able to analyse street cleanliness more quickly and accurately, enabling more effective deployment of manpower and resources.

Drone docking stations are expected to be installed on top of public toilets managed by the FEHD, serving as bases for take-off, landing and charging. The team revealed that flight tests for the project will commence soon.

Phased trials

Electrical & Mechanical Services Department Senior Engineer (Drones, Robotics & Automation) Vanessa Yau said her team is applying to the Civil Aviation Department for operational approvals.

”The trials will be conducted in two main stages. In the first stage, flights under visual line of sight and extended visual line of sight will be tested. Once stable performance is achieved, beyond-visual-line-of-sight operations will be tested for fully automated aerial patrols.”