American invention uses "spray analytical ionization mass spectrometry" to quickly and accurately identify fingerprints. In August, "Science" magazine wrote an article "spray analytical ionization mass spectrometry" (referred to as DESI) article. Professor Demian Effa and his team. What is remarkable about this technology is that: unlike traditional optical technology, DESI is a chemical technology. It can quickly and accurately identify fingerprints, is easy to operate in the field, and is also familiar with overlapping fingerprints and situations where criminals have been in contact with objects. The working principle of this technology is: in a very small fingerprint area (about 0.15mm × 0.15mm), spray a mixture of charged methanol and water. When these small droplets come into contact with the fingerprint, it will automatically extract the chemical substances in the fingerprint to create a liquid film. As the droplets sprayed in the fingerprint area increase, the previously formed liquid film will spread out and be drawn into the spectrometer. At this point, the spectrometer begins to analyze the collected molecules. This process takes only tens of seconds. DESI "clawed out" the true murderers by identifying the molecules contained in the fingerprint. Each molecule on the fingerprint is given a so-called chemical "pixel" by the spectrometer. The meaning of "pixel" here is of course different from the pixel on the screen: the latter represents a color, while the former represents a molecule. The fingerprint is composed of individual fingerprint fragments. DESI is a technology based on chemical principles. Therefore, compared to visual technology, it has another great advantage: the ability to detect people who have left fingerprints has touched those items before. Effa and his colleagues have tested cocaine, marijuana, explosives, etc., which their fingers have touched in the experiment. In addition, DESI can easily handle overlapping fingerprints that are difficult to discern clearly with optical technology. DESI will not only become a weapon for detectives to detect cases, but also has the potential to attract the attention of doctors. Because DESI can also test organ secretions on fingerprints. Although these secretions stay on the fingerprint, they are the direct products of the metabolism inside the body. Therefore, they can be regarded as one of the indicators of human health. Perhaps, we can look forward to the day when doctors can diagnose a patient's condition by scanning a piece of the patient's skin. Now, Graham Cooks, a member of the Alfa team, has successfully produced a DESI instrument with a built-in micro mass spectrometer. This instrument is as big as a medicine box and is suitable for forensics to carry with you. Facing the increasingly powerful fingerprint analysis technology, it seems that it is time for the habitual criminals to converge their hands.
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