Bangkok Police set up a committee to probe the Prawet police station's case investigator for allegedly allowing actress and model Anna Hamblaouris to leave the crash scene on Friday morning, in which a policeman was killed.
The committee was expected to complete the probe and report to the city police chief in 30 days.
The model's Mercedes Benz slammed into the parked police car on a Bangkok road at around 3am last Friday and killed Pol Sub-Lieutenant Napadol Wongbunndit, 44, who was asleep inside the vehicle.
Pol Colonel Uthit Chantharangsi of Prawet police station said that superintendent Pol Colonel Metha Jiamkraisri had assigned him to lead the committee to probe suspicions raised by the public.
The city police were determined to clarify: why the woman wasn't apprehended after the crash; why she didn't undergo an alcohol test after the crash; and why police reportedly let her go home afterwards, he said.
The result would be submitted to the city police head office in 30 days, he added.