Core Viewpoint - The article discusses the illegal activities of individuals posing as private detectives in China, highlighting a recent case where a suspect was arrested for infringing on personal information under the guise of providing detective services [1][3]. Group 1: Illegal Activities - A suspect named Yang, 46, was arrested in Shanghai for using the title of "private detective" to engage in illegal activities such as stalking, photographing, and installing tracking devices to invade personal privacy [1][3]. - Various companies advertise "private detective" services online, claiming to offer nationwide services for locating individuals and conducting personal investigations [3][5]. - One investigation company quoted a price of 20,000 yuan per week for tracking services, indicating that the duration would likely exceed one week for comprehensive results [5][8]. Group 2: Legal Implications - The legal community asserts that there is no official classification for "private detectives" in China, and individuals or companies operating under this title may lack the legal authority to conduct investigations [10]. - Engaging in activities such as unauthorized surveillance can lead to charges of illegal use of listening and photographic equipment, as well as violations of personal information protection laws [11][14]. - A lawyer noted that selling over 50 pieces of personal information, or using such information for criminal activities, constitutes a crime, with no minimum threshold for quantity or value required for prosecution [13].