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Characteristics

glass evidence case study

Someone put tape on the original crack in an effort to hold the glass together. The densities of glass fragments are measured using a technique known as the 'floatation process'. She was beaten beyond recognition. Several days later, he told the glass repair man that he had compiled a list of missing valuables to give police through his attorney. She states that she last saw her husband Thursday evening at his home. A check of insurance records revealed that Mrs.

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Characteristics

glass evidence case study

This feature is an added benefit for cold case investigators. All the glass fragments should be collected and labeled so that reconstructions can be made if desired. Evidence Collection and Laboratory Examination After establishing the factual position, our second responsibility was to gather evidence at the crime scene. Edge of broken glass showing rib or heckle marks Patterns and marks on glass surfaces are also used in the reconstruction process. Bromoform and acetone will be used in this experiment as well. For example, burglars will leave traces of their presence behind and will also take traces with them.

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Case Study: Theft and Murder Unraveled by Forensic Investigation

glass evidence case study

The nature of paint Paint is made up of three main components. When the second impact occurred, there was already a vertical primary crack near it. Glass can also be found in some unlikely places too — like our , ears, underneath the fingernails or even in the skin. Record the density on the data table. Its presence always links a suspect and victim to one another and to the scene of the crime.

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Glass as Forensic Evidence: Purpose, Collection & Preservation

glass evidence case study

Each of those times, County Court Judge Anthony Aloi told the jury they could consider that testimony as evidence of the couple's relationship and Ron Meadow's potential motive. She stated that she did indeed have a key to Mr. If it is too thin and weak, an injured party may have recourse against the building owner. One method of matching glass fragments is by a density comparison. Large shards of annealed glass can be razor sharp. Evidence is seized and submitted to the lab for analysis.

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Glass as Forensic Evidence: Purpose, Collection & Preservation

glass evidence case study

The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Media New York. Williams was found guilty of the two murders and convicted of first-degree murder. Case 1: Terrorist Storage Locker Armenian nationalists rented a storage locker in the Cleveland area during the 1970s for the storage of guns and explosives. Evidence from Marie Bunsen 1. In most cases, at least 99% of the population will be excluded as contributors and the pool of random individuals who could have contributed the sample is less than 1% of the population. Or comparing fragments obtained from the clothing of a hit-and-run victim with samples taken from a vehicle.

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Evidence in cold

glass evidence case study

The glass of liquid and the white powder are submitted to the toxicology lab for analysis. Samples of glass should be collected from the representative source i. The test measures how much light is reflected and how much is absorbed by the sample. Calculate the volume of the object by subtracting the volume of the water step 3 from the volume of the water plus object step 4. These run between the radial fractures but on the same side of the glass as the impact. It is especially useful with irregularly shaped objects. What burglar would take the time to lock the family dog in an upstairs bedroom? She says that her husband had been seeing another woman named Eva Avogadro.

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Broken Glass Evidence in Crimes and Accidents

glass evidence case study

Samples should be kept dry and be placed in containers of appropriate size and material. To minimize the importance of such mistakes, repeat the density determinations at least three times, perhaps on different pieces within each evidence bag to strengthen your case. Lesson Summary Broken glass at a crime scene is a very important type of forensic evidence. She said that she cleaned the house from top to bottom every Friday afternoon as Mr. The fragment is immersed in silicon oil and mounted on a hot platform under a microscope.

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Crystal Clear: 3 Ways to Analyse Glass Evidence

glass evidence case study

Terry is a Fellow of the American Academy of Forensic Sciences and a member of the editorial board of the Journal of Forensic Sciences. Hence the density of the glass is known. She is also a brunette of medium height and build. Terry may be reached at. In shower door injuries, for example, large clumps of heavy glass can call on a naked bather and cause far more than just superficial lacerations. Avogadro is very pale and apologizes for her appearance.

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Characteristics

glass evidence case study

Kravitz, the nosy next door neighbor, tells police the Mr. Lavoisier was also questioned by police. They stopped at the new glass edge that was created by a primary crack from the first impact. Angle 1 is called the angle of incidence and angle 2 is called the angle of refraction. Williams was suspected to have committed most, if not all, of the 28 murders.

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