Singha beer heiress Chitpas "Tant" Kridakorn, a former co-leader of the anti-Yingluck government protests, withdrew her police application, saying tearfully she did not have enough luck.
The 30-year-old former key member of the Democrat Party held a press conference at Dusit Thani Hotel in Bangkok on Thursday to speak of her wish to join the police as a deputy administrative inspector at the Patrol and Special Operation Division.
She said that the withdrawal of her application was to stop concerns among the police and possible social conflicts in the future.
Earlier, she passed an interview and a physical checkup for the application and was waiting for an admission committee to check her qualifications.
She told reporters on Thursday that she had undergone normal application procedures and had not known if she would be admitted.
Many police opposed her appointment because they found her protest role undermined the dignity of police.
"In relation to my past demonstrations, I had neither intentions nor behaviours that insulted the dignity of the police. I only expressed my demand for police to be the ones on whom people can really depend," Ms Chitpas said.
She also said that photos had been doctored to blame her for damaging a police headquarters sign and her English-language interviews during her past protests were distorted.
"I deeply regret that I don't have enough luck to join the police and wear a police uniform to be a people's protector," she read her script tearfully.
Ms Chitpas, who is a child of Singha Estate chairman Jutinan Bhirombhakdi, a member of the now-defunct National Reform Council, sidestepped reporters' question why exactly she wished to join the police.
She only replied that she would work for public interest as a member of the Muan Maha Prachachon for Reforms Foundation.
The organisation was founded by the People's Democratic Reform Committee (PDRC) after its successful protests in 2013-14 to oust Yingluck Shinawatra.
Ms Chitpas, a Democrat party member who later resigned to join the PDRC, said her political career would be a future matter.
Shortly after the news of her application was leaked, two unofficial Facebook groups of policemen went alive with disapproval posts. Among their resentments is her role in leading PDRC members to "visit" several government agencies and clashes with police.
Since Ms Yingluck's government policy on how to deal with the PDRC protests was defensive, police were caught in a difficult position where they had to put up with abuses, humiliation and bullying by the provocative demonstrators while performing their duties at that time.
The Facebook posts claimed when a PDRC faction used gas cylinders to remove the sign and mark of the Royal Thai Police headquarters and trashed their uniforms, a move many policemen found unacceptable, she commended their action on stage.
Police bosses explained after the scandal the position she applied for was a new one created to prepare the police force for Asean Economic Community. They claimed it was a "special position", a hard-to-filled post reserved for specialists only.
The qualification they look for is English proficiencies, they said.
There were conflicting reports whether Ms Chitpas was the only applicant for the post and no detail on how many others had applied.