The Kampong Cham provincial police is questioning an officer who was detained on Wednesday for unauthorised weapon possession.
Bureau chief Heng Vuthy said on Thursday that Ly Vannak, 27, a policeman from the Ministry of Interior was arrested in Prey Chhor district on Wednesday night while he was travelling to the province.
Police found a handgun and an AK-47 assault rifle in his car. Vannak initially claimed the guns belonged to his brother Hak Peng Khim, 34, who is also a police officer at the ministry.
But on Thursday he said the guns belonged to his friend, also an officer at the ministry. After he reversed his confession, police took his urine for testing, which turned out positive for drug substances, Vuthy said.