The prison department of the Ministry of Interior has finished an investigation into the mysterious release of a former provincial police chief in Ratanakkiri province but has declined to release the findings, which are under review.
The investigation stems from a drunk driving accident that injured three people on a motorcycle.
Local rights group Adhoc says the driver in the accident was Yoeung Baloung, a former police chief who was supposed to be in jail serving 13 years for corruption crimes surrounding illegal logging. Police say a relative of the former chief was driving the car.
No one else has been apprehended for the crash, but Yoeung Baloung is now back in prison, officials said.
The prison department is trying to learn the circumstances of his release by the provincial prison, whose director has said Yoeung Baloung was temporarily let out for medical reasons.