For reference (Wikipedia):
Metropolitan Police Bureau (Bangkok)
Provincial Police division (the largest throughout Thailand)
Immigration Bureau
Tourist Police Bureau
Border Patrol Police
Central Investigation Bureau (including the railroad, marine, highway, technology police, economic police and forestry police, The Crime Suppression Division (CSD), Special Service Division (SSD)- Monarchy Protection, The Criminal Records Office, The Scientific Crime Detection Laboratory)
Narcotics Suppression Bureau
Special Branch Bureau
Office of Logistics (including Thai Police Aviation division)
Police Education Bureau (Training)
Office of the Surgeon General (Responsible for medical and healthcare-related services for the police, including forensic science and autopsies). Operates hospitals in Bangkok, Chiang Mai and Yala.