Lift Fingerprints Methods

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Popular Methods of Collecting Fingerprints

CSI fan or not, collecting fingerprints is still an important part of forensic science. As a matter of fact, it is a great help to almost all CSI or Crime Scene Investigators throughout the world.

Crime scene investigators are trained with different ways to collect fingerprints. Aside from latent prints, they are also trained to take known prints. Latent prints are fingerprints left behind by people in crime scenes and other environments. They are left accidentally. Known prints, on the other hand, are submitted willingly. They are taken through the use of black ink. The process would be to put the person's thumb in the ink and then press it on a white card. Most of us are familiar with this because this is usually done whenever traveling documents and the like are processed.

How to Lift Latent Prints

Method 1: Dusting

This is the most common technique in collecting fingerprints. This is done with the use of a brush and a special type of black powder. Once the crime scene investigator arrives in the crime scene, the one in charge of latent prints or the latent print technician will start looking for fingerprints. He or she will use the brush and powder. These work because it can stick to the oil in the fingerprint. Afterwards, he will use sticky tape to lift the prints. It works because it can lift both the dust and the oil. Then the prints will be stored in an evidence card.

Once the prints reach the crime lab, the latent print examiner will analyze it. They will try to match it with another print stored in IAFIS or Integrated Automated Fingerprint Identification System of the FBI.

Though dusting may not be very effective in most instances, especially if the material is "compromised" or it has been touched already which can lead to "inconclusive" results, crime scene investigators can try other methods of collecting fingerprints.

Method 2: Electric Pen

This is another way of collecting fingerprints. With this method, a metal filing brush and electric pen is used. The "brush" is an electromagnet that can take iron filings. Similar to ordinary brushes, it does not affect the prints. The print just sticks to the oil. You can then lift the print using sticky tape or other types of adhesives.

Method 3: Special Chemical Bonding Agents

When using special chemical bonding agents, crime scene investigators will set the object in a specially heated area.

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