forensictoxmod1 - Module 1 Page 1 of 11 Printable View of:...

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Print Save to File Printable View of: Module 1 File: Module Overview Module Overview Module 1: Sample Preparation and Presumptive Tests Introduction Welcome to Module 1. In this module we will introduce you to the steps that are required in the initial examination of drug-related evidence including note taking and preliminary and confirmatory testing. Our primary objective in this module is to help you understand the procedures involved in the initial examination of drug related evidence, and the screening of these samples for subsequent instrumental analyses. The ultimate goal of drug analyses is to unequivocally identify the drug or drugs present in a sample by determining the chemical structure of the substances present and to determine, where possible, the amount of those substances present. Such qualitative and quantitative confirmatory tests are conducted after the samples are initially screened using preliminary drug tests . Preliminary drug tests allow drugs to be classified into a particular chemical group, but do not unequivocally identify the presence of a specific chemical compound. Preliminary test results can then be used as a guide to the appropriate confirmatory tests or methods that need to be applied to determine and verify the structure of the chemical compounds present in a drug related sample. Objectives At the end of this module students should: 1. Be able to describe and record evidence received. 2. Be able to determine appropriate storage conditions until analysis. 3. Understand the need for appropriate controls and the nature of positive and negative control samples. 4. Understand the significance of false positive and false negative tests. 5. Understand the difference between preliminary and confirmatory drug tests. 6. Understand the chemistry of preliminary drug tests such as spot tests, microcrystal tests, and the microscopical analyses of cannabis. Assignment 1. In some jurisdictions, forensic chemists will testify based on data obtained only from presumptive tests. What are your views on this practice? Page 1 of 11 Module 1 8/2/2009 https://elearning.courses.ufl.edu/webct/urw/lc2786794951071.tp2796168319071/selectItem. ..
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File: Sample Acquisition, Storage, and Quality Control 2. In some jurisdictions, the outcome of presumptive testing in drug cases may be used to charge the accused. Only if the case goes to court is the confirmatory drug test conducted. What are your views on this practice? Discuss the advantages and the pitfalls. Post your responses on the bulletin board forum for "Module 1." Sample Acquisition, Storage and Quality Control Module 1: Sample Preparation and Presumptive Tests Sample Acquisition, Storage, and Quality Control Contamination One of the biggest concerns of any forensic laboratory and the point of attack for many defense attorneys is the possibility of sample contamination. A major crime laboratory handles many thousands of drug cases each year, often in a limited amount of laboratory space. Every effort must be made to avoid the
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forensictoxmod1 - Module 1 Page 1 of 11 Printable View of:...

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