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Determination of the most effective enhancement process for latent fingermarks on Clydesdale Bank and Royal Bank of Scotland £5 and £10 polymer banknotes
تعیین مؤثرترین فرآیند تقویت برای اثر انگشتهای نهفته در بانکهای Clydesdale و رویال بانک اسکاتلند اسکناس های پلیمری 5 پوند و 10 پوند-2020 Fingermarks are commonly found at crime scenes and can be used to link an individual to an object and/
or place. One common evidence type regularly encountered in the course of a criminal investigation is
banknotes, and the recovery of fingermarks from these notes can give an indication of who has handled
them. This study was carried out in order to determine the most effective sequential processing
techniques for recovering latent fingermarks on the new £5 and £10 Clydesdale Bank and Royal Bank of
Scotland polymer banknotes. No previous studies have been published on the recovery of latent
fingermarks from these types of polymer notes; therefore, this work provides valuable insight into the
challenges associated with these notes. Initial experimentation was done in order to determine the best
light source to be used in combination with each sequential process tested. From this, infrared (730–800
nm) and ultraviolet (350–380 nm) light were chosen for use in the main study. Black iron oxide powder
suspension and black magnetic powder were two of the enhancement treatments tested, both of which
are recommended ‘Category A’ processes in the Fingermark Visualisation Manual produced by the Home
Office. Superglue fuming – using PolyCyano UV—which is a Category C process was also used, as well as
the recently developed infrared fluorescent powder, fpNATURAL12. Three fingermark donors were selected for this study—one good, one medium and one poor—and each donor deposited a 10-mark depletion series onto both sides of each type of note. Superglue fuming (using PolyCyano UV) followed by
black magnetic powder was found to be the most effective sequential process for enhancement of
fingermarks on all note types tested. Infrared (730–800 nm) light with an 815 nm
filter was the most effective light source for enhancing ridge detail for this enhancement sequence. This process is now being
implemented for use with these note types in Scotland. Keywords: Polymer banknotes | PolyCyano UV | Infrared | Black magnetic powder | Powder suspension | fpNATURAL12 |
مقاله انگلیسی |
2 |
An efficient and eco-friendly workflow for dual fingermark processing and STR profiling
گردش کار موثر و سازگار با محیط زیست برای پردازش علامت دو انگشت و نمایه سازی STR-2020 Since its discovery in 1997, DNA retrieved from touched or handled items (touch DNA) has been increasingly used in
criminal casework. Depending on the nature of the substrate examined, numerous techniques are being used for
fingermark (FM) collection and development, however, it has been shown that FM processing may impede or even
prevent the dual analysis of FMs and DNA. In search for a possible solution, we have recently established a novel
workflow for a non-destructive collection and eco-friendly visualization of latent FMs using white BVDA gel-lifters and
black Wetwop® solution. In the present study, the scope and limitations of the proposed protocol were thoroughly
examined for DNA recovery and genotyping in relation to substrate type (porous and non-porous), time elapsed after
the deposition (1, 7 and 14 days) and donor’s gender. The study included 120 developed FMs of 20 donors (10 males
and 10 females, aged 25–50 years), from which 240 DNA samples were recovered and quantified. The independent
analysis of two DNA samples recovered from each FM, one - from the adhesive surface of the gel-lifter and the other -
from its imprint on the protecting acetate cover, allowed us not only to increase the total number of the identified
donors, but also to achieve a higher level of confidence per FM. Though this approach appeared to be more efficient on
non-porous substrates (up to 65% on car tin), it is noteworthy that forensically useful DNA profiles (with at least 8 full
STR loci) were generated from poor-quality FMs on the porous substrate, drywall (25% and 15% in males and females,
respectively). Finally, the integration of the results of touch DNA analysis and that of FM visual inspection allowed us to
increase by more than half the number of personal identifications and to strengthen the chain of forensic evidence. Keywords: Forensic science | Fingermarks | BVDA gel-lifter | Wet powder | Touch DNA | Short tandem repeats |
مقاله انگلیسی |