Essay about Chapter 5 Forensic Toxicology

682 WordsFeb 28, 20153 Pages
Chapter 5 – Forensic Toxicology 1. What are the three areas covered by forensic toxicology? Toxicology covers post-mortem drug testing, workplace drug testing and investigations into contraband materials. 2. Name six specimen types that are often tested in forensic toxicology. Under what circumstances is each specimen preferred? Blood – When testing for DUI’s, and two samples for every death case. Urine – Preemployment drug testing and is preferred over blood as its eacsy to collect large amounts. Bile and liver fluid – Useful for identifying certain types of drugs Hair – Preemployment testing and is advantageous for looking further back in time Oral fluid – Provides the same benefits of urine without invasion of privacy Breath – Used…show more content…
Gas chromatography without a mass spectrometer detector relies solely on retention time however the use of a mass spectrometer detector allows for all components of a mixture to be separated. The advantages of mass spectrometer detectors are that it’s often highly unique and provides a fingerprint of the molecule and therefore one can use both the retention time and unique mass spectrum in order to identify substances. 8. What are three methods of metal analysis? Which is the optimal method and why? Three of the methods of metal analysis are colormetric assays, Atomic Absorption Spectrophotometry and neutron activation analysis however inductively coupled plasma-mass spectrometry is the optimal method as it is the most modern and of very high quality. 9. Describe the process of interpreting drug results in the context of preeemployment drug testing. Why is drug testing for employed individuals more difficult? Preemployment drugs test usually use the person in question’s urine, results are interpreted by comparing the level measured to an acceptable baseline. These baselines are not set at 0 because even second hand exposure can lead to trace amounts being metabolised and shown in the urine. Drug testing employed individuals is more difficult as it is usually in the context of confirming that drug abuse was the cause for erratic behaviour, this involves a blood test rather than urine, and further to this there is no agreed level

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