The aim of the article is to analyze the EU regulations regarding the leniency program in competition law and its impact on cartel detection. First of all the purpose and substance of the leniency program have been analysed, moreover the article analyses EU regulations on partial and full leniency as well as differences with American competition law. The article uses the formal-dogmatic and legal-comparative resarch methods – mainly American solutions were used for comparision with EU law. The thesis of the article is the statement that the leniency program should not be considered as the main legal instrument for detecting cartels but it should complement other instruments. The research results can be used for further research on legal regulations which are used for detecting cartels
