The Difference Between Preliminary Field and Laboratory Testing

Handling and processing evidence is an integral component of crime scene management because it lays the foundation for everything the court must consider when weighing the admissibility of evidence. For the most part, the courts prefer testing being carried out in a laboratory setting. However, there are exceptions, such as times when an initial examination also yields valuable information. In this assignment, you will differentiate between testing that might be done on-scene versus in the laboratory, identify testing that might be subject to preliminary testing, as well as compare the different results yielded by preliminary field versus laboratory testing. Support your assignment with examples from this week’s required material(s) and/or a minimum of three other scholarly or credible resources and properly cite any references.

Prior to beginning work on this assignment, please review the following:

From the text:
Chapter 8: Pattern Evidence 1: General Patterns and Fingerprints
Chapter 9: Pattern Evidence 2: Firearms, Tool Marks and Document Analysis
From the free, downloadable resource at the web page Crime Scene Investigation Guide (Links to an external site.):
Section D – Completing and Recording the Crime Scene Investigation
Section E – Crime Scene Equipment
The articles:
An Automated Approach to the Classification of Impact Spatter and Cast-Off Bloodstain Patterns
Chemical Enhancement of Footwear Impressions in Blood Recovered from Cotton using Alginate Casts
From the free PDF copy at the web page Strengthening Forensic Science in the United States: A Path Forward (2009) (Links to an external site.):
Section 10. Automated Fingerprint Identification Systems
Section 11. Homeland Security and Forensic Science

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