Under Thai law, namely the Criminal Procedural Code, an injured person may bring a criminal case to a criminal court without having a public prosecutor file the case for him or her. After the court conducts an inquiry into the case, the court considers whether to accept the case for further trial and determine whether the defendant should be penalized accordingly. Private parties involved in certain types of cases, such as labor disputes or shareholder disputes, may find this a common channel to pursue. Criminal law in Thailand recently underwent a significant change, as new legislation changed numerous criminal offenses to become phinai-fine offenses instead. However, as this is a relatively new development, there are still instances in which plaints involving phinai fines are still being submitted to the court by these private injured persons as criminal cases. But this raises the issue of whether the court can proceed with such cases. For over a year, Thailand has enforced the Act on Phinai Fine Proceedings B.E. 2565 (2022) (ACFP) as a new legal measure to decriminalize certain types of fines for criminal penalties with less-serious offenses to phinai offenses, which results in phinai-related offenders having to pay only fines instead of facing the entire criminal procedures and penalties under the Thai Penal Code and Criminal Procedure Code, including bail submission, travel restrictions, imprisonment, and a criminal record. What happens to ongoing trials in court for phinai offenses? The ACFP automatically changed criminal offenses under 204 pieces of legislation, including certain offenses under the Bankruptcy Act B.E. 2483 (1940), the Determining Offenses Relating to Registered Partnership, Limited Partnership, Limited Company, Association, and Foundation Act B.E. 2499 (1956), the Labor Relations Act B.E. 2518 (1975), the Consumer Protection Act B.E. 2522 (1979), the Public Limited Companies Act B.E. 2535 (1992), and