The article presents the results of studies on the method of sensibilizing dactyloscopic traces directly from the gaseous phase. The detection of dactyloscopic traces on absorbtive surfaces requires specific revealing methods, whose essential aspect is the need to deliver reagent to the place of occurrence of the corresponding component of trace forming substance. In practice, for many years, various types of solutions have been used for this purpose, such as DFO, ninhydrin and 1,2-indanedione. Within the framework of this study, research was carried out on revealing fingerprints on absorptive surfaces with the use of genipin, under reduced pressure conditions and in order to compare against the liquid phase. Based on the results of the tests carried out and results obtained, it should be stated that the genipin vacuum sublimation technique can be successfully used to reveal fingerprints on absorptive surfaces. The traces revealed are visible both under white light and fluorescence illumination. The effectiveness of the dactyloscopic trace sensibilization method in the gaseous phase has been demonstrated with regard to such substances as ninhydrin and genipin.

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The history of forensic science (from Latin criminalis, concerning a crime) is inextricably linked to the history of law enforcement agencies. This science grew out of the needs of the law and serves its implementation to this day. Its interest is focused on the crime in concreto. As an independent scientific discipline, it developed only at the end of the 19th century and was connected with the date of publication of the work Handbuch fur Untersuchungsrichter, Polizeibeamte, Gendarmen u.s.w. by the Austrian investigating judge H. Gross in 1893. Its author noticed the correctness (very accurate) that every achievement in the field of natural sciences and technical sciences can serve the purpose of combating crime. W. Sobolewski is considered a precursor of Polish forensic science. In September 1919 he joined the State Police and started working as an inspection officer. Then he became the commander of the Main Police School and Officer School in Warsaw. In 1929 he was sent to Vienna for a forensic course. Then W. Sobolewski headed the Police Laboratory at the Headquarters of the Investigation Service in Warsaw, and since 1931 the Department of Investigation Technology, in which, at the request of the court, police authorities and military institutions, forensic expert opinions were carried out, including dactyloscopic, weapons and handwriting. They were of great evidential importance for the courts. It continues to be so today. Beginning in the interwar period, the Central Forensic Laboratory of the Police is a research institute recognized in Poland and abroad, which carries out tasks in the field of technical and criminal protection of the process of preventing and combating crime, among others, by performing research and implementation, comparative and expert work in the field of forensic science.

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