The article investigates the questions connected with reference of threat to safety of the suspect (accused), who concluded the pre-judicial agreement to a type of counteraction to preliminary investigation. Based on the study of methods and objectives of the impact on the suspect (accused), who entered into a pre-trial agreement on cooperation, the authors outline a variety of these processes that are manifested in the form of threats, carried out in order to: get the person to refuse to testify against another suspect (accused) who has been called criminal liability; change the testimony to more favorable for the latter; to revenge for the assistance to law enforcement agencies and, ultimately, to obstruct the implementation of the preliminary investigation and respectively failure to reach the criminal proceedings. On the basis of the foregoing the conclusion is made to classify security threats (of the accused), who has entered into a pre-trial agreement on cooperation to a counter type of preliminary investigation, which necessitates the development of a set of measures designed to overcome this kind of opposition.