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A new CSI tool could pinpoint when fingerprints were left behind

Date:
August 12, 2015
Source:
American Chemical Society
Summary:
The crime scene investigators on TV's popular CSI: Crime Scene Investigation series seem able to solve any mystery thanks to a little science and a lot of artistic license. But now there is a real-life technique that could outperform even fictional sleuths' crime-busting tools. Scientists report a way to tell how old fingerprints are. This could help investigators determine which sets are relevant and which ones were left long ago.
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The crime scene investigators on TV's popular CSI: Crime Scene Investigation series seem able to solve any mystery thanks to a little science and a lot of artistic license. But now there is a real-life technique that could outperform even fictional sleuths' crime-busting tools. Scientists report in ACS' journal Analytical Chemistry a way to tell how old fingerprints are. This could help investigators determine which sets are relevant and which ones were left long ago.

Law enforcement officials have long relied on fingerprints left behind by criminals to help solve cases. In addition to patterns of whorls, loops and arches specific to individuals, prints can also yield clues as to the owners' age and gender, as well as materials -- such as explosives or make-up -- that they may have touched. But determining just how long these residues have been at a crime scene is one aspect that has remained a challenge. The ability to date fingerprints would allow police to more easily rule certain suspects in or out of their investigations. Shin Muramoto and colleagues wanted to find a way to meet that need.

The researchers studied various molecules in fingerprints and found that a substance called palmitic acid migrates away from print ridges at a predictable rate. Based on this diffusion, the scientists could estimate how old a fingerprint was. Their findings apply to prints up to four days old, but they plan to expand that window to 10 days.


Story Source:

Materials provided by American Chemical Society. Note: Content may be edited for style and length.


Journal Reference:

  1. Shin Muramoto, Edward Sisco. Strategies for Potential Age Dating of Fingerprints through the Diffusion of Sebum Molecules on a Nonporous Surface Analyzed Using Time-of-Flight Secondary Ion Mass Spectrometry. Analytical Chemistry, 2015; 150727111732002 DOI: 10.1021/acs.analchem.5b02018

Cite This Page:

American Chemical Society. "A new CSI tool could pinpoint when fingerprints were left behind." ScienceDaily. ScienceDaily, 12 August 2015. <www.sciencedaily.com/releases/2015/08/150812131502.htm>.
American Chemical Society. (2015, August 12). A new CSI tool could pinpoint when fingerprints were left behind. ScienceDaily. Retrieved May 22, 2017 from www.sciencedaily.com/releases/2015/08/150812131502.htm
American Chemical Society. "A new CSI tool could pinpoint when fingerprints were left behind." ScienceDaily. www.sciencedaily.com/releases/2015/08/150812131502.htm (accessed May 22, 2017).

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