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The article considers the issues of preparing materials for sending it to carry out diagnostic and situational expert research of weapons, cartridges and traces of its use, the work of an investigator or a person acting as an investigator during an inspection of the crime scene. It is also pointed how to identify, correctly document and seize objects and materials for referrals for expert research, identification, preliminary inspection and assessment of objects and materials found during the inspection of the crime scene, its documentation and seizure. The correct examination and assessment of weapons and cartridges makes it possible to obtain information about preliminary data on the type, kind, model of weapons and cartridges, taking into account the design of objects by external similarities with known types and models of weapons, samples of cartridges. It is also makes possible to identify the external state of weapons and cartridges, the presence or absence of individual parts and mechanisms of the weapon; loaded, equipped with a weapon; destruction of parts of weapons, elements of cartridges; deformation of weapons and cartridges; presence of corrosion, pollution, etc. The presence of outside traces on weapons and cartridges that are significant for further investigation - this may be contamination, including blood stains, layers, etc., which will be taken into account when conducting diagnostic and situational expert research.There are described general methods and rules of preparation and packing of the objects revealed at inspection of a crime scene.

PREPARATION OF MATERIALS FOR DIAGNOSTIC AND SITUATIONAL EXPERT RESEARCH OF WEAPONS, CARTRIDGES AND TRACES OF ITS USE