Thereafter, the senior officers of each region not only controlled all provincial police assigned to their respective geographic areas but also directed the railroad, highway, marine, and forestry police units operating there, without going through the chain of command to the Central Investigation Bureau in Bangkok.
Setelah itu, para perwira senior dari masing-masing daerah tidak hanya dikontrol semua polisi provinsi yang ditugaskan di daerah masing-masing geografis tetapi juga diarahkan kereta api, jalan raya, laut, dan polisi kehutanan unit beroperasi di sana, tanpa melalui rantai komando ke Biro Investigasi Sentral di Bangkok.