Thursday, August 02, 2007

Chemical Fingerprinting BS


by blogger jgl

Just for the record, I *rarely* pee on my hands.

Chemical residues contain a few millionths of a gram of fluid and can be found on all fingerprints. Conventional fingerprinting techniques often distort or destroy vital chemical information with no easy way of lifting residues for chemical imaging, until now.

Imperial scientists found that the use of gel tapes, commercial gelatine based tape, provides a simple method for collection and transportation of prints for chemical imaging analysis.

The prints, once lifted, are analysed in a spectroscopic microscope. The sample is irradiated with infrared rays to identify individual molecules within the print to give a detailed chemical composition…

…Chemical clues could also highlight specific traits in a person. A strong trace of urea, a chemical found in urine, could indicate a male. Weak traces of urea in a chemical sample could indicate a female. Specific amino acids could potentially indicate whether the suspect was a vegetarian or meat-eater…

Krrk… This is your Fantasy Land tour guide. Please prepare for our return to reality…

17 comments:

Anonymous said...

This new chemical fingerprinting technique is awesome. If this is proven to actually work the number of crimes that are unsolved should decrease and it should make putting a criminal profile together a lot easier. KD

Anonymous said...

This new technique in fingerprinting would significantly lower the time it takes to identify the suspects in a crime. They would be able to easier identify if the assailant through the process of elimation. For instance, a suspect of a crime is a white male, but the trace evidence goes through chemical fingerprinting and is determined to be a white female. This would automatically eliminate the the suspect unless there were multiple people committing the crime. This is an excellent way to eliminate suspects and ensure the correct person serves time. AR

Anonymous said...

While this new "technique" seems to be an excellent time-saver, it seems too good to be true. Obviously the use of gel-tapes is useful, and while I do think they would be helpful in detecting things such as gunpowder residue or narcotics, I doubt that the sex of the perpetrator or whether or not he or she is a vegetarian could be determined by the fingerprints. As a non-forensic scientist, I can't say for sure if this would work or not.

Basically, if I ever commit a crime, I'll make sure there is no urine on my hands. I might even be smart enough to wear gloves. ES

Forensic Bloggers said...

good comments.

as you can probably tell from the blog entry, i tend to lean toward the skeptical side with ES. even if this technique can be proven to work in the lab, it might be tougher to use in real life.

for example, there will be so much other "junk" on the surface before the fingerprint is deposited, it could be tough to differentiate what stuff is actually coming from the print.

-jgl

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George Melcher said...

You've found a way to test your microscope using urine. Hahaha! The infrared traces of chemical can be useful in finding suspects in a crime. It just shows that you want to join the forensic team! Just continue being curious. :-)

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