TY JOUR TI PROBLEMS OF METHODOLOGY FOR FORENSIC STUDY OF POISONOUS SUBSTANCES KW examination of toxic substances; forensic research; x-ray methods of analysis; chromatographic methods of analysis; infrared spectrophotometry; examination of materials KW substances and prod-ucts; comprehensive expertise; sample preparation; mass spectrometry in inductively coupled plas-ma; AIRS “AIPSIN-Antinarcotics” JO VESTNIK ADVANCED TRAINING INSTITUTE OF THE MIA OF RUSSIA AU Kuzovlev, V.Y. AU Kharchenko, I.V. AU Geraskin, M.Y. PY 2023 IS 0 PB All-Russian Advanced Training Institute of the Ministry of the Interior of the Russian Federation