Covert police actions resulting from Article 80, Paragraph 2 of the Law on Police Affairs and Powers are one of the most powerful tools in the fight against organized crime. Categorically, they fall within the powers of the police and are applied during the investigation of criminal offenses in moderately complex and complex criminal investigations. Properly planned, well-organized and well-executed undercover police actions open the door for police authorities to collect formal evidence, which is essential for combating all forms of crime. The key to success in the fight against organized crime is that knowledge (an indication) obtained through the application of covert police actions is properly and formally fixed by evidentiary actions as legal evidence. In moderately complex and complex criminal investigations, undercover police actions can be used as an additional, auxiliary tool in combination with already existing special evidentiary actions from Article 332, paragraph 1 of the Criminal Procedure Act. Covert police actions represent a step forward in police behaviour during the investigation of criminal offenses and enable proactive police action to combat crime.