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Forensic Toxicology - the study of the chemical and physical properties of toxic substances and their physiological effect on living organisms
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Three Primary Responsibilities 1.Postmortem Drug Testing 2.Workplace Drug Testing 3.Identification of Contraband Materials
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Deaths Investigated by Toxicologists 1.Accidental Poisonings 2.Drug Abuse Cases 3.Suicidal Poisonings 4.Homicidal Poisonings
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Deaths Investigated by Toxicologists 1.Accidental Poisonings 2.Drug Abuse Cases 3.Suicidal Poisonings 4.Homicidal Poisonings
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Toxicological Analysis of Tissue a.Collect sample of all body fluids b.Collect samples from organs and tissues c.A forensic toxicologist cannot simply look for the presence of a toxin or drug in a body, she must understand how the body processes these molecules d.Toxicological analysis must start as soon as possible after a person’s death
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Toxicological Analysis of Tissue a.Collect sample of all body fluids b.Collect samples from organs and tissues c.A forensic toxicologist cannot simply look for the presence of a toxin or drug in a body, she must understand how the body processes these molecules d.Toxicological analysis must start as soon as possible after a person’s death
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General Classes of Poisons 1.Gases 2.Metallic Poisons 3.Volatile Organics 4.Non-volatile Organics - the major category here is what is known as an alkaloid, a drug that mimics human neurotransmitters or hormones and therefore interferes with normal body chemistry Alkaloids are derived from plants…
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Alkaloids Common Examples: Amphetamines – stimulants that provoke euphoria; these drugs mimic catecholamines in the human body (adrenaline, etc) Cocaine – natural stimulant that acts as a mimic to catecholamines; metabolites are detected in urine for as many as 3 days Opiates – depressants that reduce muscle activity, heartbeat, respiration, and the inclination to sleep; effective pain relievers and euphoria producing; opiates mimic endorphins in the human body Cannabinoids – fast acting plant alkaloid; body mimic is unknown; metabolites can be detected in urine for months
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Alkaloids adrenaline amphetamine cocaine ecstasy serotonin
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Example UV-vis Spectrum
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Methods of Detection 1.Color test 2.Microdiffusion test 3.Chromatography a. thin-layer chromatography (TLC) b. gas chromatography (GC) c. high performance liquid chromatography (HPLC) 4.Spectroscopy a. UV lightd. X-ray b. visible lighte. infrared c. microwave
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Example IR Spectrum
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Methods of Detection 5.Mass Spectroscopy 6.Immunoassay
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Methods of Detection 5.Mass Spectroscopy 6.Immunoassay
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Interpretation of Findings 1.Is a drug or poison present? What substance? 2.How much of the substance is present? Is it’s concentration in the body sufficient to cause death? 3.How was the drug/poison administered?
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