In modern conditions of strengthening the criminal legal protection of legal proceedings, the need for an objective evidence base is acutely increasing. Invisible and barely visible tracological traces formed by blood seized at crime scenes become an important source of investigative and evidentiary information. However, the forensic literature does not cover the causes of the origin of this type of traces, does not consider methods and means of their detection and fixation, in investigative and expert practice, isolated cases of the use of latent traces of blood-formed mapping are noted. In the article, the author, based on the analysis of literary sources on the physiology and biochemistry of blood, reveals its properties after the expiration of wounds, focuses on the processes that change its state and create conditions for the release of a transparent fraction of blood - plasma and serum. Based on experimental studies, the author comes to the conclusion that the serum formed naturally and the plasma released when pressing on a blood clot are the trace-forming substance due to which latent traces of the display are formed. The mechanism, patterns of formation and collection of these traces, their resistance to changes under the influence of external factors for a long period of time have been established. Based on the physical and chemical properties of the trace-forming substance (plasma and blood serum), the most effective methods and means of detecting and fixing traces are determined, depending on their prescription and characteristics of the trace-receiving surface. The results of the study can be used in the production of inspections of accident sites and expert research, which will significantly expand the volume of forensic information used to search for persons who left traces and obtain forensic evidence of their involvement in the commission of crimes.
EXAMINATION OF THE SCENE, SHOE SOLES, LATENT TRACOLOGICAL TRACES OF BLOOD, PLASMA AND BLOOD SERUM
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