The present article deals with the Institution of agent view in current Slovak legislation. We are dedicated to the possibilities of its use for detection purposes and also proving the corruption crime. Deal with the legal possibilities for using the Institution’s agent - controller and analyze the possibility of enjoyment Institution agent - agent provocateur. Those institutes enshrined in the Slovakian criminal procedural value adjustments to match the terms of their legality and admissibility in the context of European legislation and case law. Emphasize the importance of inquiry agent and she deals with aspects of the agent questioning the use as evidence in criminal proceedings. She makes analysis of the characteristics of that admission and emphasizes that agents have obtained information in criminal proceedings, the nature of the evidence. The author notes that the agent’s testimony is largely problematic, since under European Court of Human Rights, significantly weakens the right of defense and the right to a fair trial and to the extent that our current adjustments to these questions is not in accordance with European legislation.