Work to advance metrology for forensic fiber trace evidence has been underway since July 2015 through efforts to establish novel comparison metrologies for fibers and evaluation of the uncertainty in commonly used techniques. One such effort has been our work to look at the phenomenon of photofading in cellulosic fibers when analyzed by microspectrophotometery.
Forensic evidence is a crucial component of criminal trials. The STG performs research to advance the metrology for forensic fiber trace evidence, reduce uncertainty in applicable measurement systems, and guide forensic examiners. The STG works with the forensic trace evidence, academic, and industrial communities to help advance the metrology for forensic fiber trace evidence through participation in standardization bodies and has co-organized several workshops in the area of trace evidence. . The STG has several projects in this focus area, which include the evaluation of uncertainty in commonly used techniques, the assessment of advanced metrologies for forensic fiber examination, and the development of guidelines for understanding the effects of environmental exposure on fiber comparisons.
We have performed a series of studies to investigate the phenomenon of photofading on dyed fibers in the microspectrophotometer.