TY JOUR TI On the use of information and materials obtained in the course of operational investigative activities to prove the truth in a criminal case KW criminal procedure KW operational investigative activity KW proof KW evidence KW truth KW means of proof KW adversarial JO Legal Science and Practice: Journal of Nizhny Novgorod Academy of the Ministry of Internal Affairs of Russia AU Abdullaev, Y.D. AU Miller, V.Y. PY 2022 IS 2022 PB Nizhny Novgorod Academy of the Ministry of the Interior of Russia