Ashlyn, Justyn, Nathan, Skyler
In science, the term glass is a broader sense, meaning every solid that possesses a non-crystalline. An atomic-scale structure that shows a glass transition when heated towards the liquid state. Therefore, porcelains and other such things familiar from everyday use, are physically glasses also. These sorts of glasses can be made of quite different kinds of materials:
Polymers.For many things such as bottles and eyewear polymer glasses such asacrylic glass, polycarbonate, polyethylene terephthalate are all a lighter alternative to traditional silica glasses.
Most glass is lost very quickly depending on what the carrier does and the texture of their clothing.
Forensic scientists are usually interested only in freshly broken glass (fragments are clean and sharp-edged). These are compared to samples of broken glass from the scene through refractive index measurements (measures the degree to which the glass bends light) and chemical analysis tests.
Refractive Index (RI) is very accurate and can distinguish between a large number of different glasses. If the tested fragments are different from a sample, then they did not come from the same piece of glass.
Chemical analysis gives information about the chemical makeup of the glass (sand and other materials used in manufacture). Chemical analysis is used to distinguish between glass samples which have the same RI but different chemical composition.
Also, the surfaces of fragments will be microscopically examined for evidence of the method of manufacture and the type of object they came from.
If the glass matches the reference sample both in RI and chemical composition then they must determine how rare it might be. The scientist may consult a computer database containing the results for each and every reference glass sample examined by his lab.
Pauline and Anthony Freeman Case
Victim- Pauline and Anthony Freeman
What happened- Hit and run
When- February 19, 2010
Suspect- Louis Marcus Marchei
Trace evidence- Control Glass from the windshield, Glass from bin in driveway where car was found, Glass in outer clothing of Victims matches that from suspects car.Verdict- The accused plead guilty to the murder of Pauline Freeman, the Critical Injuries cause to Anthony Freeman, and failing to stop at a fatal car accident.
The abundant glass fragments established forceful contact between the vehicle and a victims of a hit and run and
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