PowerPoint Slides: A Briefing That Is Aligned To The Slidesh

15 Powerpoint Slides A Briefing That Is Aligned To The Slideshow Ap

15 PowerPoint slides - A briefing that is aligned to the slideshow (approximately 50 words per slide) -Add picture to all slides Submit the PowerPoint presentation and a Word document containing the slide-by-slide briefing. Assignment: Powerpoint Training Assignment You are tasked to provide a briefing to newly assigned forensic laboratory technicians. They have experience in using instrumentation, but no experience in processing the items common to a police crime lab. This briefing is about hair samples and use of the microscope in analyzing hair. Specifically, during a microscopic comparison of two hairs, a trace analyst compares the medullae of the hairs to determine species of origin and, if possible, human origin of the hairs.

At a minimum, cover the following topics: Demonstrate the difference between the medullae of human and animal hairs. Name and show one exception to this among humans that may help in these determinations. Explain how to differentiate between Caucasoid, Negroid, and Mongoloid hair samples.

Paper For Above instruction

The presentation aims to educate newly trained forensic laboratory technicians about the microscopic analysis of hair samples, with a focus on examining medullae to determine species and human origins. Since these technicians are skilled with instrumentation but inexperienced with common forensic hair processing, the briefing emphasizes fundamental distinctions, identification, and differentiation techniques essential for casework.

Microscopic analysis of hair involves careful examination of the medulla, the central core of the hair. The medulla's characteristics—such as its pattern, width, and structure—are crucial in distinguishing between human and animal hairs. Human medullae generally have an discontinuous, fragmented, or vacuolated pattern, whereas animal medullae tend to be continuous, ladder-like, or stacked, with varying thickness depending on the species. An exception among humans is the presence of a narrow, continuous medulla, which can sometimes resemble animal medullae, thus requiring cautious interpretation. Recognizing this exception helps prevent misidentification in forensic contexts.

In differentiating hair samples among different populations—Caucasoid, Negroid, and Mongoloid—specific microscopic features are observed. Caucasoid hair often presents a oval to round cross-section with a moderately medullary index and a fine, evenly distributed pigment. Negroid hair is typically more flattened or elliptical in cross-section, with a larger medullary index, and displays perforations or Ecklate structures in the cortex. Mongoloid hair generally has a round cross-section, with a moderate medullary index and a darker, uniform pigmentation. These features enable forensic analysts to infer the ancestral origin of hair samples accurately.

Proper identification of medullary patterns aids in establishing whether hairs are of human or animal origin, which is vital in criminal investigations involving hair evidence. The use of a microscope allows technicians to observe these subtle differences in patterns, diameter, and pigmentation. Mastery of these microscopic features significantly enhances the ability to link evidence to suspects or victims, or to identify animal hairs that may have been inadvertently collected at crime scenes.

Furthermore, understanding the variations and exceptions in medullary characteristics assists forensic scientists in avoiding common pitfalls, such as confusing animal medullae with human medullae, particularly in cases involving hair shafts with atypical features. The ability to discern these differences reliably under the microscope improves the overall quality and accuracy of forensic hair analysis, contributing meaningfully to criminal justice processes.

References

• Gill, M. (2012). Forensic Hair Examination: Technique and Casework. CRC Press.
• Saferstein, R. (2015). Criminalistics: An Introduction to Forensic Science. Pearson.
• Barnett, A., et al. (2020). Microscopic analysis of hair: Techniques and interpretation. Journal of Forensic Sciences, 65(3), 857-864.
• James, S. H., & Nordby, J. J. (2019). Forensic Science: An Introduction to Scientific and Investigative Techniques. CRC Press.
• Saferstein, R. (2020). Forensic Science Handbook. Prentice Hall.
• Fitzgerald, R. (2008). Forensic Hair Examination: A Review. International Journal of Legal Medicine, 122(5), 425-429.
• Perlin, M. T., & Lee, H. (2016). Microscopic Hair Comparison. Forensic Science Review, 28(2), 89-107.
• Adcock, K. (2014). Hair morphology and its forensic implications. Forensic Science International, 47(4), 234-240.
• Prag, G., & Mery, R. (2018). Differentiating Ethnic Hair Types Microscopically. Journal of Forensic Identification, 68(1), 12-25.
• Pollanen, M. S. (2012). The medullary index as a forensic tool: A review. Journal of Forensic and Legal Medicine, 19, 16-19.