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6-5 Collection and Preservation of Toxicological Evidence

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Presentation on theme: "6-5 Collection and Preservation of Toxicological Evidence"— Presentation transcript:

1 6-5 Collection and Preservation of Toxicological Evidence
Unit 6: Toxicology April 22, 2015 Sanders

2 Testing for Toxins To determine toxic drug substances the forensic toxicologist must devise an analytical scheme to detect isolate identify May 20, 2019 Unit 6: Toxicology

3 Forensic Toxicologists
Forensic Toxicologist extract from biological fluids tissues organs. Looks for drugs, heavy metals, carbon monoxide. May 20, 2019 Unit 6: Toxicology

4 Accuracy A screening test gives quick insight into the likelihood that a specimen contains a drug substance. May 20, 2019 Unit 6: Toxicology

5 Detecting Drugs in the Hair
Hair is nourished with blood, blood tainted by drugs becomes part of the hair and permanently part of the hair. May 20, 2019 Unit 6: Toxicology

6 Analysis Since hair grows at 1 cm per month, there is a fairly accurate timeline of drug consumption. May 20, 2019 Unit 6: Toxicology

7 Positive Test Results Positive results arising from the screening test are tentative at best and must be verified with a confirmation test. May 20, 2019 Unit 6: Toxicology

8 Confirmation Test The most widely used screening test or thin layer chromatography, gas chromatography, and immunoassay. May 20, 2019 Unit 6: Toxicology

9 Drug Confirmation Test
Gas chromatography/ mass spectrometry is generally excepted as confirmation test of choice. May 20, 2019 Unit 6: Toxicology

10 Drug’s Effect Once a drug is extracting identified, a toxicologist may be required to judge the drugs effect on an individual's natural performance or physical state. May 20, 2019 Unit 6: Toxicology

11 May 20, 2019 Unit 6: Toxicology


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