Variability and subjectivity in the grading process for evaluating the performance of latent fingermark detection techniques
MetadataShow full item record
When assessing latent fingermark development methods, forensic researchers commonly evaluate treated samples using a grading scale. However, the subjective nature of these evaluation methods leaves the results of such investigations open to criticism for potential grader bias. Assessment of fingermark development quality is ultimately dependent on an individual's background and experience. A pilot study was conducted as a preliminary stage of a large-scale international collaboration. A set of 80 fingermark samples was developed with 1,2-indanedione-zinc chloride. Grades for photographic images of the developed fingermarks were assigned independently by 11 fingermark researchers. Sixty-seven percent of the scores given to each individual sample were the same as the median grade, and 99% of the scores were within 1 grade. The researchers were also assessed on their consistency by including 20 duplicate images to be graded. Seventy-eight percent of the grades given were identical to their original scores. These results indicate that a small group of independent fingermark graders is sufficient to produce reliable and consistent data in projects requiring the assessment of fingermark quality.
Published with permission
Showing items related by title, author, creator and subject.
Fritz, Patrick; Van Bronswijk, Wilhelm; Patton, Emma; Lewis, Simon (2013)Amino acid variability in sweat may affect the ability of amino acid-sensitive fingermark reagents to successfully develop all latent fingermarks within a large population. There has been some speculation that age, gender, ...
Investigations into the Influence of Donor Traits on the Performance of Fingermark Development Reagents. Part 1: 1,2-Indanedione-Zinc ChlorideFritz, P.; Frick, A.; van Bronswijk, W.; Beaudoin, A.; Bleay, S.; Lennard, C.; Lewis, Simon (2017)This study outlines the use of 1,2-indanedione/zinc chloride (IND/ZnCl2) to treat fingermarks with a view to observing possible trends that may be present in a donor population. Fingermark samples from 131 donors were ...
Zadnik, S.; Van Bronswijk, Wilhelm; Frick, Amanda; Fritz, Patrick; Lewis, Simon (2013)Commercially available fingermark simulants werecompared to latent fingermark deposits to assess their efficacy asstandards for a quality control assessment of fingermark developmentreagents. Deposits of the simulants and ...