BEFORE prie-trial investigation: Operational surveillance- a method of operational activity, when information is obtained secretly and the object is observed directly.DURING the prie-trial investigation: the prie-trial judge, upon the prosecutor's request, may order the observation of a person or a motor vehicle. In urgent cases, these actions may be conducted based on the prosecutor's or pre-trail inevistagator's decision. In such a case a pre-trail investigation judge's sanction for these actions must be received within 3 days. If such a sanction is not received, the observation must be terminated adn the data received immediaely destroyed.