Hong Kong police used pepper ball launchers to deal with mobs. In Hong Kong, pepper ball launchers are regarded as non-lethal weapons and can be used to disperse and subdue criminal suspects. When using this weapon, the police need to abide by relevant laws, regulations and safety regulations, and use it within a suitable distance to ensure that it will not cause excessive harm to personnel. In Hong Kong, the use of pepper ball launchers requires specific training and authorization, so users need to have relevant qualifications and experience.