TY JOUR TI NARCOTIC DRUGS OF THE FENTANYL GROUP AND THE PROBLEMS OF THEIR FORENSIC INVESTIGATION KW FENTANYL KW 3-METHYLFENTANYL KW RESEARCH OF NARCOTIC DRUGS KW SYNTHETIC ANALGESICS KW CHROMATOGRAPHIC METHODS JO FORENSIC EXAMINATION AU Kharchenko, I.V. AU Geraskin, M.Y. AU Gladyrev, V.V. PY 2024 IS 0 PB Volgograd Academy of the Ministry of Internal Affairs of Russia