Corruption crime cases in law enforcement have extended risks for the society, as they may undermine confidence of the citizens in law enforcement organs, causing safety deficits. Prevention and elucidation of these crimes are equally important tasks for the authorities. Simultaneously, prevention and elucidation of corruption crimes in law enforcement is – due to several factors – very difficult, and open methods are frequently not enough for a successful prosecution. For an effective elucidation are use of secret tools and gathering data in conspiracy indispensable. In the present paper the author examines certain legally specified secret tools from the aspect how they can be used in criminal procedure of police corruption crimes. Further he analyses the effective regulation system in criminal procedure, also from the perspective how they can cover the total demand system of elucidation, upon practical experiences.