Private detectives have been providing their services in Lithuania for about a decade; however, only now has the Seimas of the Republic of Lithuania started to discuss whether it is expedient and necessary to regulate the activities of private detectives by means of a separate law. One of the goals of a separate legal regulation of private detective activities is the protection of human rights, particularly the right to privacy. This article examines the provisions of national and international legislative acts related to the private life of a person, and assesses the opportunities of a private detective to provide private detective services without prejudice to the provisions of applicable legislative acts. The article concludes that a private detective is not an authorized (public) authority and there is no possibility to assess in each case whether the interests of a person using the services of private detectives are more important than those of other persons, which would allow for violating their rights to private life. The limits of an individual’s right to privacy can only be narrowed by a particular person, giving consent to making public the details of his/her private life. It is the only opportunity for a private detective to gather information related to the private life of a citizen. Currently applicable legislative acts in Lithuania do not provide for opportunities for private subjects to collect personal data without that person’s consent. This right is grantedonly to public authorities and with the court’s permission.