T The immigration office plays a crucial role in overseeing and monitoring the movement of foreign nationals entering and exiting indonesian territory. this study aims to conduct an in-depth analysis of court decision number 88/pid.sus/2024/pn jkt.utr, which examines the application of law by the judge in the case of tan ni and whether it aligns with the immigration law. consequently, the research problem focuses on how foreign nationals (wna) can enter indonesian territory without undergoing inspection at the immigration checkpoint (tpi) and without carrying immigration documents, as well as whether the administrative immigration sanctions imposed by the immigration office and the criminal immigration sanctions against tan ni, a chinese national, comply with law no. 6 of 2011. this research employs a normative research method, utilizing library studies as a source of secondary data, with a qualitative approach to data analysis and a deductive method for drawing conclusions. the research findings indicate that the entry of foreign nationals into indonesian territory without inspection at the tpi and without immigration documents can occur due to several factors, including socio-economic factors, land border vulnerabilities, the use of internet technology, and limitations in surveillance. therefore, there is a need to strengthen surveillance and monitoring at both land and sea borders. in the case of tan ni, the imposition of a 4-month prison sentence is in accordance with the immigration law; however, given the defendant\\\'s criminal history, the judge may consider this to impose a higher sentence within the maximum limits stipulated in article 113 of law no. 6 of 2011 on immigration.