Doctor of Law, Professor of the Department Dolzhenkov O.F. and Major of Police, PhD in Law Lesnichenko D.V. conducted a binary lesson on the problems of inquiry as a form of pre-trial investigation for 4th year students majoring in 081 Law. Currently, this issue is relevant for future lawyers, as from July 1, 2020 in the criminal procedure legislation came into force a new institution for the Criminal Procedure Code in the version of 2012 - "investigation of criminal offenses."