The ability to visualize the presence of cellular material deposited by touch onto items of forensic importance has the potential to greatly aid in criminal investigations. It is now routine in forensic casework to examine items for DNA assumed to have been deposited by touch [1-3]. Such DNA is often referred to as 'touch DNA' even though samples collected from such deposits can also include DNA from undetermined biological sources other than that derived from skin and/or background DNA from actions other than touching [4]. Visualizing the location of cellular material, and therefore the source of DNA, will allow examiners to target sampling to areas where DNA is present, and not sample areas where DNA is absent.Without knowledge of cellular material location, collection of DNA,

No abstract