Bewerbung » ost common evidence crime scene investigators solve their case

crime at all Air Max 90 Grise Pas Cher , there are many ways evidences can transpire. One of it is called latent print, which is one of the most common evidence crime scene investigators solve their cases with. Latent prints are the type of prints formed by sweat of natural oils from the finger that is transferred onto a surface that is smooth enough to be able to sustain the print. This type of print cannot be seen by the naked eye and would require scientific methods to unveil them.


There are two categories in which latent prints can be divided into, which are porous and non-porous. Porous refers to prints that are left on surfaces that are usually conducive for the preservation of prints, such as paper and unfinished wood because the residue left by the finger can soak into their surface. Non-porous Air Max 90 Rose Pas Cher , on the other hand, refers to surfaces of evidence that cannot absorb such residue, making the prints extremely fragile as they can be easily destroyed with a wipe. Examples of non-porous evidence are like plastic, glass Air Max 90 Rouge Pas Cher , and metal. In instances where one cannot be sure whether the evidence fall under porous or non-porous, they will be treated as non-porous so that they will be handled more carefully in case they get wiped off as it gets shipped to the laboratory, destroying the evidence.


If you are wondering how to collect a latent print, there are a number of ways to actually do it. While with known prints Air Max 90 Blanche Pas Cher , which are willingly submitted fingerprints, you can easily press your fingers onto black ink and then press the inked fingers onto a white card which creates the print; latent prints, which are accidentally left fingerprints, require much more expertise in attaining them. The most common technique is brushing Air Max 90 Noir Pas Cher , which is done by brushing a special dark powder which would stick to the finger residue on non-porous surfaces. When a latent print is found, they will use a sticky tape to adhere the powdered fingerprints and is then stored in an evidence card. The latent prints are then analyzed in the lab, where they will try to match the unknown fingerprints to its owner on the FBI’s AFIS, which is a fingerprint identification system.


There are other ways on how to collect a latent print as well Air Max 90 Pas Cher Soldes , such as cyanoacrylate vapor, iodine fuming, and other technologies. Using the cyanoacrylate vapor technique, super glue will be heated Air Max 90 Pas Cher Chine , and then placed with object tested in an airtight container where the cyanoacrylate vapor from the super glue will make the latent print visible without disturbing the object it is on. This technique can be used for both porous and non-porous latent prints. For iodine fuming, the porous object will be fumed in a chamber before being processed with ninhydrin or silver nitrate processing to reveal the latent print. Many technologies are being invented now to make fingerprint collection more efficient. Whichever the method, they all aim to benefit the society to keep them from harm.


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Rajeev Kher
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