St. Petersburg, Russian Federation
The article reveals the issues of using the thermal method to detect handprints on cash register receipts made of paper with a heat-sensitive layer (hereinafter referred to as thermal paper). Based on an analysis of the reaction of thermal paper to high temperature, the fundamental possibility of identifying handprints on these objects has been established, the features of the process of visualizing handprints have been revealed, and a list of equipment necessary for this has been determined. The optimal values of temperature exposure on cash register receipts to detect handprints have been determined experimentally, recommendations for using the hardware of the computer program PIA 7 000 v.3.22 to evaluate the image of the trace obtained on the receipt have been given. The advantage of the thermal method, according to the authors, is the relative ease of its use and the absence of the need to use special physical and chemical substances to identify traces. The disadvantages include the possibility of destroying the trace if it is incorrectly identified, and the need for special laboratory equipment - a muffle furnace. It is concluded that the use of the thermal method to identify handprints on cash register receipts expands the capabilities of fingerprinting and fingerprint examination in the scientific and methodological support of solving and investigating crimes.
HANDPRINTS, FINGERPRINTING, RESEARCH METHOD, CASH REGISTER RECEIPTS, HEAT-SENSITIVE LAYER
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