The Poisoners Handbook Forensic Science 21715 No Drill Drill Quiz Take out a sheet of notebook paper and copy down these drills question AND answer 129 23 When done get a copy of How Toxic is Toxic and finish working on the questions ID: 368550
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Slide1
Intro to Poisons:The Poisoner’s Handbook
Forensic Science
2/17/15Slide2
No Drill – Drill QuizTake out a sheet of notebook paper and copy down these drills, question AND answer:
1/29, 2/3
When done, get a copy of “How Toxic is Toxic?” and finish working on the questions.Slide3
ObjectivesIWBATClassify and identify multiple poisons. List their effects and the tests used to detect the poison.
Define LD
50
and apply the concept to poisoning.Slide4
Pd. 5 – Drug Identification
The challenge
of
forensic drug identification comes in selecting analytical procedures that will ensure a specific identification of a drug.
This plan, or scheme of analysis, is divided into two phases.
Screening test that is
preliminary to
reduce the possibilities to a manageable number.Confirmation test that is a single test that specifically identifies a substance.
DRUGSSlide5
Preliminary Analysis
Faced with the prospect that the unknown substance may be any one of a thousand or more commonly encountered drugs, the analyst must employ screening tests to reduce these possibilities to a small and manageable number.
DRUGSSlide6
Confirmational Determination
Once this preliminary analysis is completed, a
confirmational
determination is pursued.
Forensic chemists will employ a specific test to identify a drug substance to the exclusion of all other known chemical substances.
Typically infrared
spectrophotometry
or gas chromatography-mass spectrometry is used to specifically identify a drug substance.
DRUGSSlide7
IR Spectrum of CocaineSlide8
IR Spectrum of NovocaineSlide9
Collection and Preservation
The field investigator has the responsibility of ensuring that the evidence is properly packaged and labeled for the laboratory.
Generally common sense is the best guide, keeping in mind that the package must prevent the loss of the contents and/or cross-contamination.
DRUGSSlide10
Often the original container in which the drug was seized will suffice.
All packages must be marked with information that is sufficient to ensure identification by the officer in the future and establish the chain of custody. Slide11
How Toxic is Toxic?What is LD50
? Why is it a
useful concept?
What are the concerns with using LD
50
? Is it always useful??Slide12
The Poisoner’s Handbook
We will be watching “The
Poisoner’s
Handbook,” a PBS special about the rise of forensic science in New York City, focusing on the poisons that were common causes of death in the 20s and 30s.
While watching the video, keep track of all of the poisons mentioned in the video, along with their effects, tests for them, and famous cases.
Also, take notes on Alexander
Gettler
and Charles Norris—who were they? What role did their personalities and backgrounds play in their lives?Slide13
ClosureList one poison discussed in today’s segment
Symptoms of poisoning
Test used by the scientists
Famous case involving this poison