The Khmer Police took care of traditional police functions within Site Two. Until 1987 overall camp security was the responsibility of a special Thai Rangers unit known as Task Force 80, however this unit violated human rights extensively until it was disbanded in April 1988 and replaced by the DPPU (the Displaced Persons Protection Unit), a specially trained paramilitary unit created in 1987 expressly to provide security on the Thai-Cambodian border. The DPPU was responsible for protecting camp boundaries and preventing bandits from entering the camp