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Testing Procedures for Evidence: 3 Scenarios Essay Example

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Testing Procedures for Evidence: 3 Scenarios

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Testing Procedures for Evidence: 3 Scenarios. The major weakness of this analysis, however, is that it is difficult to collect paint chips or smears from the crime scene. This is because the paint may mix with other materials such as car grease and dirt. Furthermore, collecting the evidence from the surface of the vehicle is delicate, and great care should be taken while removing the paint from the undermost layer close to the paint.In an attempt to minimize the impact of the paint evidence, the defense attorney can develop an issue on the measurement of the diffuse reflectance of paint. He or she may argue that conditions such as contamination, abrasion, texture or weathering affect the reliability of the evidence gathered. This may provide discriminating information to the scientist in trying to differentiate the surfaces originally painted.

The impact on the client is thus minimized.2) As the detective on call you arrive at the location of an apparent un-witnessed hit and run vehicular incident. A pedestrian has been killed. Scattered over the roadway are small fragments of orange and white plastic and small cubes of glass, which are being collected by the police. How would you expect the continuity of this evidence be assured? Describe laboratory tests which should be performed. What will be the likely evidential value of the results?Specimens collected at the scene of the crime such as hit-and -run are used physical evidence. This is because, during the commission of a criminal act, microscopic amounts of material may be transferred from one surface to the other. Through linking the transferred material back to its source, a connection between the suspect and scene may be established. For this reason, almost all substances found at the scene may become evidence and hence should be examined in a laboratory. This paper outlines the forensic testing procedure for specimens.The small fragments of orange and white plastic found at the scene would imply that two vehicles one painted white, and another one painted orange were involved or that the vehicle involved was painted both colours. Analyzing automotive paint can be used to identify the make, model and occasionally the year of manufacturing a vehicle.A number of laboratory tests can be performed to link this evidence with the suspect (Thornton, 1982). These tests include:Powerful comparison microscopes are usually used to compare and contrast thickness, colors luster and layer patterns. They can also be used to. Testing Procedures for Evidence: 3 Scenarios.

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Wilkinson, J.M., Locke, J., & Laing, D.A. (1988). The examination of paint as thin sections using visible micro-spectrophotometry and Fourier transform infrared microscopy. Forensic Science International, 38, 43-52.

Thornton, J. I. (1982) Forensic Paint Examination. In: Forensic Science Handbook (Vol. 1). Saferstein, R. (ed.). Prentice-Hall, New Jersey, pp. 529-571.

Tweed, F. T., Cameron R., Deak, J. S., & Rodgers, P. G. (1974) The Forensic Microanalysis of Paints, Plastics, and other materials by an Infrared Diamond Cell Technique, New York: Mc Graws- Hills Journal of forensic science 4:211-218.

Layton, J. (2008). How Crime Scene Investigation Works. New York: Wiley and Sons.

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