Accounting the Accuracy of Measurements in the Conducting Forensic Research of Cold Bladed Weapons

Introduction. The main issue solved during the forensic research of cold bladed weapons is the establishment of the object’s belonging to the category of cold weapons. In this case, the measurement of the hardness of the blade is one of the main features, which determine the belonging to the cold weapon. Theoretical analysis. Analyzed compliance of the techniques of establishing the object belonging to a cold weapon to the requirements of metrological norms and rules. It is shown that conducting measurements is an important stage in the production of forensic examinations, and the correctness of the performance of measurements largely affects the correctness of the conclusion. Discussion of results. It is determined that the existing methodology is in contradiction with the existing metrological rules and the ways of overcoming these contradictions are indicated, namely, an algorithm for taking into account accuracy in measuring the hardness of the blade is proposed.

Metrological Aspects of Forensic Ballistic Reserch

Introduction. Conducting forensic ballistic investigations often involve changes to the results of which depend on the findings in many ways. According to local legislation, these measurements must meet certain requirements. Theoretical analysis. Analyzed compliance with the diagnostic techniques of forensic ballistic investigations homemade firing device for assigning it to firearms requirements of the Federal Law «On ensuring the uniformity of measurements». It is shown that the existing methodology is flawed, since it is in contradiction with the current metrological rules are not determined by random and systematic errors. Conclusions. It is proposed to either abandon the statistical processing of the measurement results and not to use the concept of the mean value, or increase the number of measurements for correct statistical treatment of results.