Department of Special Investigation

The Department of Special Investigation (DSI), under Thailand's Ministry of Justice (MOJ), operates independently from the Royal Thai Police (RTP) and is responsible for tackling high-profile crimes and transnational criminal enterprises. Its mandate includes against transnational organized crime, counterintelligence, counterterrorism, and investigating complex cases that impact national security, involve organized crime, or implicate high-ranking officials and law enforcement.

Source: Wikipedia — Department of Special Investigation (CC BY-SA 4.0)