This final paper at its beginning describes the basic terms that are essential for distinguishing the position of a person during the criminal proceedings. The terms described are: a suspect, a defendant, an accused and convict and the name itself changes depending on the stage of the criminal proceedings. During the treatment of the suspect, later the defendant, the police officers and the state attorney take different actions, depending on the type and circumstances of the crime. However, an indispensable part of any treatment toward the defendant is the conduct of an interview with the person, i.e.the conduct of the interrogation itself, which must be performed according to strictly defined procedural rules. In particular, this has led to a change in the way police officers involved in criminal investigations, i.e. police investigators, work. Most of this paper is focused on the interrogation procedure of the defendant and the applicable regulations governing such conduct, the legal position of the defendant, clearly defined procedural rules during the examination, his rights and the manner of ensuring the presence of the defendant in the proceedings. The interrogation of the suspects, the later defendant, follows the clearly defined procedural rules where police officers have no right to make a mistake and, in fact, the interrogation should be the last action they take before filing a criminal report, depending of course on the type of crime and circumstances, expressing tactics of action.