engleski

Comparasion between PolyCyano UV and Cyanoacrylate in fingerprint marks detection

The goal of detection is induction and fixation of fingerprint marks on objects connected to the perpetrator of the offense. The aim of this study was comparative crime scene fingerprint marks analysis by cyanoacrylates and PolyCyano UV for fast and accurate personal identification. The fingerprint marks detection using cyanoacrylate and PolyCyano UV methods was performed on 1000 different nonporous surfaces (glass, PVC, lacquered wood, metal, etc.) from crime scene cases. The methods are carried out in cyanoacrylate chambers, under strictly defined and controlled conditions, such as temperature and moisture. Also, time of exposition is also important and dependent on chamber size. Fingerprint marks induced by cyanoacrylate are white colored and easily detectable on dark surfaces, opposite to fingerprint marks on light surfaces. Therefore, the forensic white light or color enhancer is necessary for their visualization. The advantage of cyanoacrylate method is the persistence of fingerprints ; however, additional treatment to induce fingerprints marks is needed. Opposite to that, PolyCyano UV method requires shorter induction time for fingerprint marks without additional treatment. Thus, induced fingerprints are visible under UV light by using the appropriate UV filter. This method is particularly suited for colorful backgrounds, due to fluorescent properties of PolyCyano UV. Moreover, PolyCyano UV fluorescence is decreasing over time. Due to this fact, photographs should be processed as soon as possible. In conclusion, further research is needed to improve the PolyCyano UV method for better crime scene fingerprint marks detection.

forensic science; crime scene; fingerprint marks detection; cyanoacrylate and PolyCyano UV methods

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