Evaluation of Fingerprint Powders on Different Surfaces for use on Crime Scenes in Jamaica using the Dusting Method

KODYE KASHEEMA BOYD

University of the West indies

This research aims to assess the effectiveness of fingerprint powders on different surfaces. This evaluation can provide critical information to the forensic departments when processing crime scenes. Fingerprint analysis with use of powders is a quick biometrics technique that was developed and has assisted in the solving of many cases. Print enhancement is dependent on the ability of the powder to stick to the moisture of the surface left behind by individual’s finger who touch it. The study was performed using ten (10) different surfaces and seven powders, three sets of prints were placed on each surface. Results obtained were ranked using grading system that consists of four categories which ranged from zero (0) to five (5). The nonporous surfaces had the best prints and highest values when cumulated using the grading system which ranged from 38 - 94. In contrast, the porous surfaces had the least grades ranging from 4 - 26. This was also confirmed in the T-test where[ t = 5.435, Df = 68, P < .001]. Therefore, there was a statistical significance between the surface type. In terms of the colour powder it was seen that the black powders were more compatible on all surfaces than the other colours. The brush types also affected fingerprint clarity, with excess powder carefully removed and motions applied gently to preserve prints. Technique was also an important aspect; the ability of the magnetic powder to attract and detach powder flakes produced the cleanest and most detailed prints when compared to the regular powders. Fingerprint powder enhancement is one of the best techniques used to enhance latent prints. However, a drawback when using this technique include difficulty in differentiating the print from the surface. Therefore, these factors such as the technique, color and type of surface should be considered when selecting powders for print recovery.

Keywords: evaluation; fingerprint development; surface porosity; dusting method.