The scientific article pays attention to the consideration of the concepts of “criminal offense”, “criminal offense”, “crime” andtheir implementation in criminal and criminal procedure legislation. Amendments to the legislation that came into force in connectionwith the adoption of the Law of Ukraine “On Amendments to Certain Legislative Acts of Ukraine on Simplification of Pre-trial Inves -tigation of Certain Categories of Criminal Offenses” are considered. The issue devoted to the new subject of criminal procedure – thecoroner and the head of the inquiry body is investigated.The article considers the types of evidence that are taken into account in the investigation of criminal offenses. Such evidenceshould include: explanations of persons, results of medical examination, expert opinion, testimony of technical devices and technicalmeans that have the functions of photography and filming, video recording, or means of photography and filming, video recording. Thepossibility of using evidence in the investigation of crimes is considered.During the criminal proceedings, a new entity is identified, which is actually engaged in the investigation of criminal offenses,such an entity is the investigator. Inquiry is a new unit that investigates criminal offenses. Inquiries are carried out by inquiry subdivisionsor authorized persons of other subdivisions.A criminal offense is an act (action or omission) provided by the Criminal Code, for which the main penalty is a fine of not morethan three thousand non-taxable minimum incomes or other punishment not related to imprisonment. Procedural sources of evidencein criminal proceedings on criminal offenses, in addition to certain Art. 84 of the CPC, there are also explanations of persons, the resultsof medical examinations, expert opinion, indications of technical devices and technical means that have the functions of photographyand filming, video recording, or means of photography and filming, video recording.The legislator does not rule out that the sources of evidence are testimony, physical evidence, documents, expert opinions, but infact the explanations of persons, the results of medical examinations, expert opinion, indications of technical devices and equipmentthat have the functions of photography and filming, video or photo – and filming, video recordings are also identified as sources of evidence.The purpose of such a division is to distinguish between sources of evidence that can be used to prove crimes and criminal offenses.In addition, there is a misunderstanding – what exactly can we use to form the evidence base in criminal proceedings.