During the examination of criminal, civil and administrative cases the issue is established by means of gathering and changing of evidences. The special knowledge is of no small importance for realisation of this task. This knowledge is very often used nowadays direct by specialists and experts of prosecuting agency or of court of justice. In the Republic of Moldova, according to the legislation in force, the prosecuting agencies and courts use special knowledge of three types such as participation of specialist in the process of criminal investigation, execution by the specialist of technical-scientific establishment execution of legal examination.