P Pretrial is a horizontal oversight mechanism that has the authority to examine the legality of arrests, detentions, termination of investigations, or termination of prosecutions in accordance with article 77 of the indonesian criminal procedure code (kuhap). this authority was further expanded by constitutional court decision no. 21/puu-xii/2014, whereby pretrial proceedings are also authorized to examine the legality of the designation of a suspect, searches, and seizures. this study aims to analyze the provisions regarding the designation of a wanted persons list (dpo) after the submission of a pretrial application under the theory of criminal procedure law, and to examine whether such action contravenes supreme court circular letter (sema) no. 1 of 2018, with a case study focus on decision no. 4/pid.pra/2024/pn gst. the research method employed is normative juridical with a descriptive-analytical approach. data were collected through library research and then analyzed qualitatively using deductive reasoning to draw conclusions. the findings indicate that based on the provisions of criminal procedure law, the principle of due process of law, and the principle of fair trial, the designation of a person as dpo after a pretrial application has been submitted cannot nullify the suspect’s right. the validity of the application must be assessed based on the legal circumstances at the time of the filing date of the pretrial application.