Jomsap has consistently maintained her innocence.

The inquiry into Pol Lt-Colonel Tossapol Thammawong and Pol Colonel Prathum Phrommee should be transparent and the results submitted to the Supreme Court via the Nakhon Phanom Provincial Court within 30 days, the group said.

Mongkolkit Suksintharanon, vice chairman of the foundation’s centre that takes complaints about cases allegedly involving scapegoats, submitted the request to Pol General Chakthip Chaijinda via deputy spokesman Pol Colonel Kritsana Pattanacharoen at the Royal Thai Police headquarters in Bangkok.

Mongkolkit said the plaintiff’s side had presented witnesses and forensic evidence at last week’s hearing at the provincial court as part of Jomsap’s retrial application, but the forensic officers who handled the crash evidence did not testify as prosecution witnesses.

The group wanted the officers to explain their findings in order to ensure justice, he added.

Jomsap was sentenced to three years and two months in jail for allegedly running over and killing an elderly bicyclist. She was granted a royal pardon in April 2015 after serving 18 months behind bars.