Pol Colonel Patarapon Sanitwong Na Ayutthaya, the superintendent at Dusit police station, said he would propose the appointment of a committee to look into the case to ensure fairness and thoroughness.
He would put the proposal to Metropolitan Police Area 1 next week and the request could be passed on to the Metropolitan Police Bureau.
He would not summon Chai for the moment, but would study the submitted evidence first, he said.
Yingluck on Friday had her lawyers file a defamation lawsuit against Thai Rath cartoonist Chai Rachawat for comparing her to a prostitute.
They charged that Chai – real name is Somchai Katanyutanan – with three counts: insulting an official during an official event, defaming another person via publicity and violating the Computer-related Crimes Act, which prohibits posting defamatory comments against others on the Internet.