A thorough investigation of the criminal case is largely dependent on correct planning and conducting of investigation activities. This includes, in some cases, covert investigation activities, without which, it is practically impossible to find circumstances surrounding the case. However, any investigation activities are somehow related to the restriction of human rights, specifically, restriction of the privacy rights: conducting such investigation activities is allowed only when there is a legitimate objective to be achieved in the democratic society, prescribed by the constitution. The relevance and applicability of these issues triggered the drafting of legislative amendments back in 2014, which aimed at enhancing the legislation, focusing on the prevention of unlawful interference in privacy rights and this precess is still ongoing today. Furthermore, the emphasis is made on selecting the important mecganism for control, which can ensure the protection of the private lives of humans. the paper discusses the significanceof covert investigation activities, historical developments, and the pros and cons of the mentioned legislative amendments and mechanisms for control.