The purpose of this study is to investigate the application of criminal law following the determination of changes to the omnibus law and the influence such changes have on legal certainty. The study method that is being utilized is known as normative legal research, and it involves approaching the topic from legislative perspectives, conceptual perspectives, and case perspectives. According to the findings of the study, the process of criminal law enforcement has slowed down significantly in several areas where the omnibus law has made changes. This is true not only for cases that have recently taken place, but also for cases that are still in the stages of investigation and prosecution, which has led to a number of criminal cases not being resolved in court. This is due to the fact that the Omnibus Law has removed several criminal provisions from the previous law, including changing criminal sanctions to administrative sanctions. Furthermore, the Constitutional Court's decision on the Omnibus Law has never provided clarity on its application, which has caused criminal law enforcement to become stagnant. The word "stagnation" is synonymous with "bottleneck," "congestion," and "deadlock." After the stipulation of revisions to the Omnibus Law, there was a lull in the activity of criminal law enforcement, which resulted in the absence of legal certainty. Study This purpose is to recite information regarding the enforcement law criminal post determination change omnibus laws and their impact on the certainty law. The method of research that is employed is called normative study of the law, and it involves approaching legislation, approaching concepts, and approaching cases. The findings of the research indicate that case follow criminal on some changed sector _ with omnibus law laws experience stagnation in implementation enforcement law crime, both in new cases _ happened, either case criminal on stage investigation and prosecution resulting in no _ he continued enforcement law criminal to stage trial. In addition, new cases _ happened, either case criminal on stage investigation and prosecution resulting in no _ he continued enforcement law criminal to stage trial. it is due to the fact that The Omnibus Law deleted a number of criminal provisions from the Constitution before it went into effect, one of which was to change the criminal penalty into a penalty administration. However, the post-decision Court Constitution did not visit to give clarity regarding the Omnibus Law's enforceability, which led to enforcement law criminal experience stagnation. Satgnation is characterized by bottlenecks, deadlocks, and more bottlenecks. The process of changing the criminal post determination statute came to a standstill as a result. The Omnibus Law has produced outcomes that result in there being no realized certainty law