Forensic Death Investigation

Friday, December 3, 2021 5:28:06 PM

Forensic Death Investigation



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Evidence Doesn’t Lie - Forensics (Full Episode) - Real Crime

For rough surfaces, the same powdering process is used, but instead of using regular lifting tape for these prints, scientists use something that will get into the grooves of the surface such as a gel-lifter or Mikrosil a silicone casting material. Analysis of Collected Prints Once a print is collected, analysis can begin. During analysis, examiners determine whether there is enough information present in the print to be used for identification. This includes determining class and individual characteristics for the unknown print. Class characteristics are the characteristics that narrow the print down to a group but not an individual. The three fingerprint class types are arches, loops, and whorls. This pattern is characterized by ridges that enter on one side of the print, go up, and exit on the opposite side.

This pattern is characterized by ridges that enter on one side of the print, loop around, and then exit on the same side. Individual characteristics are those characteristics that are unique to an individual. Comparison of Prints After analysis, unknown prints are compared alongside the known prints. The unknown print is the print found at the crime scene, and the known print is the print of a possible suspect. First, the class characteristics are compared. If the class characteristics of the two prints are not in agreement, then the first print is automatically eliminated. If this is the case, another known print may be compared to the unknown print. If the class characteristics appear to match, the examiner then focuses on the individual characteristics.

They look at each individual characteristic point by point until they have found a possible match. Evaluation of Comparison After the examiner completes the comparison, they can make a proper evaluation. If there are any unexplained differences between the unknown and known fingerprints, then they can exclude the known fingerprint as the source. Since , our mission has been to provide accessible, achievable higher education to adult learners.

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Dental Records Another method of identification is dental records. However, like fingerprints, some sort of antemortem record must exist in order to make a comparison. Antemortem radiography of the teeth is the most effective dental record-if these records exist, a positive identification can be made. Bone structures of the jaw, roots of the teeth, and sinuses are all unique to an individual, making information gathered from dental records very useful in forensic odontology. Forensic odontology is a forensic science, which handles, examines, and presents dental evidence in court. Dental evidence can be helpful in the identification of a person, but it can also help assess their age and whether or not there were signs of violence.

For more information about forensic odontology, go here. Scientists first applied DNA to forensics in the s. In order to establish identity using DNA, examiners should retain postmortem samples such as blood, hair with root bulb, skin, and bone marrow for comparison to antemortem samples. As mentioned before, postmortem samples are the samples collected by the medical examiner and the antemortem samples are samples which were taken at some time before death. These samples must contain mitochondrial DNA or nucleated cells to be of any value. Antemortem samples can be a variety of things: hair from a hairbrush used only by the individual, a lock of hair, or clothing with stains such as blood or sweat.

Presumptive Methods There are other forms of identification which are nonscientific. This type of identification uses specific characteristics to come to a reasonable basis of identity for the unknown individual. They usually only give you enough evidence that you can presume your identification is correct. Physical attributes This includes: sex, age, ancestry, eye color, and hair color are often used.

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