Download - Fs Ch 10
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Chapter 10
Drugs
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Forensic ScienceRichard Saferstein
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Introduction
Natural/synthetic substance: produces physiological/ psychological effects.
Narcotics: (analgesics) relieve pain by depressing the central nervous system.
The most common source for these narcotic drugs is opium, extracted from poppies.
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Family
Drugs, guns and money
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Opiates
Morphine: extracted from opium/synthesize heroin.
Heroin: drowsiness/sense of well-being/three to four hours.
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Other Opiates OxyContin: (oxycodone) same
physiological effects on the body as opium narcotics.
-chronic pain.
Methadone: synthetic opiate -given to heroin addicts -given for pain
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Drugs
Black tar heroin
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Black tar heroin
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Foil packets
This is a clue
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Little balloons are a clue
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Not for kiddie parties!
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Balloons recovered from stomach during an autopsy
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Syringe
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This is a clue as to what happened.
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Heroin
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Personal use? Packaged at this
quality usually indicates international smugglers. The scorpion indicates this originated in Asia
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Hallucinogens
Hallucinogens: changes in normal thought processes/perceptions/moods.
-marijuana -controversial
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MarijuanaCannabis Plant:
-THC-tetrahydrocannabinol-THC content varies. -THC-rich resin: hashish.
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A little marijuana
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A lot of marijuana
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Holy smokes. A weekend in Vegas ha ha.
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No trying to explain away as personal consumption.
This will buy a distribution charge as well.
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Other Hallucinogens
LSD-synthesized from lysergic acid-hallucinations >12 hours
Phencyclidine: (PCP) -Angel dust -smoked, ingested, sniffed.-mixed with other drugs-feelings of
strength/invulnerability/depression/violence and suicide.
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Depressants Depressants:
-functions of the central nervous system-calm irritability/anxiety/induce sleep-alcohol-barbiturates-tranquilizers
-inhalants
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Depressants Alcohol: -bloodstream to the brain-suppress thought processes/muscle
coordination Barbiturates: “downers” -orally/well-being/relax the body/produce sleep Tranquilizers: orally-relaxing tranquility-no impairment of high-thinking faculties or
inducing sleep. Sniffing: (huffing)immediate effects-exhilaration/impairs judgment/organ
damage/death
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Stimulants
Amphetamines-meth (crank)-speed-cocaine (crack/ice/rock)-increase alertness/activity-decrease in fatigue-loss of appetite-awake/sleep for days
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Stimulants Meth:-snorted/injected/smoked/orally-newest drug scourge-highly addictive
Cocaine: coca leaves -alertness/vigor-suppression of hunger/fatigue/boredom-Crack: cocaine mixed with baking
soda/water/heated-glass pipes-1980’s-epidemic in U.S.
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Bag of meth
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Not your average street addict’s choice of pipes
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That is more like what you’ll see on the streets.
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Meth
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A little more meth
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Personal carry on at the airport?
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A lot more meth. Manufacturing has shifted to Mexico.
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More meth
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Crystal meth. Knowing what goes into the making you have to wonder exactly what is that brownish coloring?
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Little plastic baggies indicate distribution. Within 1000 feet of a school gets you five extra years federal time.
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Cocaine; The powder is finer than heroin or meth
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Cocaine. Note the $100 bill used for snorting. In the 1980s it was considered the rich party crowd’s drug of choice.
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Crack/rock/ice cocaine
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Oops! Hello federal prison here I come
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Club Drugs
Synthetic drugs:-MDMA (Ecstasy)-GHB (gamma hydroxybutyrate)-Rohypnol (“Roofies”)-Ketamine (Special K)-GHB/Rohypnol:-CNS depressants-date rape/robbery drugs
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Club Drugs Ecstacy: (X) Methylenedioxymethamphetamine-synthetic/mind-altering-enhances self-awareness-decreases inhibitions-seizures/stroke/kidney failure/cardiac arrest
Ketamine: (Special K)-animal anesthetic -impaired motor functions/high blood
pressure/amnesia/mild respiratory depression.
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Harmless looking enough. Ecstasy.
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Some rave!
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Wow. This is what got Sammy “the Bull” Gravano into trouble.
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Anabolic Steroids
Synthetic:
-accelerating muscle growth-unpredictable effects on mood and
personality/ depression/diminished sex drive/halting bone growth/liver cancer
-popular among male high school athletes
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Steroids
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Drug-Control Laws Controlled Substances Act:
-Five schedules of classification
-potential for abuse/physical and psychological dependence/medical value
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Schedules of Classification
Schedule I: -High potential for abuse/no medical use
Schedule II: -High potential for abuse/medical use with
severe restrictions
Schedule III: -less potential for abuse/medical use
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Schedules of Classification Schedule IV:-low potential for abuse/current medical use
Schedule V:-low abuse potential/medical use
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Collection and Preservation of Drug Evidence
Properly package/label
-Prevent loss
-Chain of custody
-Background info to analyst
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Drug IdentificationSelect analytical procedures
Two phases:
Screening test
Confirmation test
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Preliminary Analysis Screening tests:
-reduce vast possibilities to manageable number
-color tests
-microcrystalline tests-size/shape of crystals formed when mixed with specific reagents
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Confirmational Determination
After initial analysis:
-confirmational determination
-specific test to identify a drug substance to the exclusion of all other known chemical substances
-infrared spectrophotometry/gas chromatography-mass spectrometry
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Qualitative vs. Quantitative Qualitative:
-identity of the material
Quantitative:
-determination of percent composition of the components of a mixture
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Chromatography Chromatography:
-means of separating/tentatively identifying components of a mixture
-chemical substances partially escape into the surrounding environment when dissolved in liquid/absorbed on solid surface
-moving phase-stationary phase
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TLC Thin Layer Chromotography (TLC):
-solid stationary phase coated onto glass plate -mobile liquid phase to separate the components of
the mixture-liquid slowly rises up the plate (capillary action)
causing sample to become distributed between the stationary phase/moving liquid phase
-colorless-visualized by placing plates under ultraviolet light/ or spraying with chemical reagent
-distance spot travels up thin-layer plate assigned numerical value (Rf value)
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Gas Chromatography GC:
-moving phase-carrier gas flows through column
-stationary phase-thin film of liquid contained in column
-mixture traverses length of the column-emerge separated into components
-chromatogram-retention time: time required for component
to emerge from GC column
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Theory of Light Light-continuous wave-white light though a prism-dispersed into a
continuous spectrum
Waves: -Wavelength-distance between two successive crests
(or one trough to the next trough)-Frequency-number of crests (or troughs) passing
any one given point per unit of time-electromagnetic spectrum-entire range of radiation
energy-Visible light-small part of electromagnetic spectrum
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Spectrophotometry Just as a substance can absorb visible
light to produce color, many of the invisible radiations of the electromagnetic spectrum are likewise absorbed
Spectrophotometry-measures quantity of radiation a particular material absorbs as a function of wavelength/frequency
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The Spectrophotometer Spectrophotometer:-measure/record absorption spectrum of
chemical substance Components: -Radiation source-Monochromator/frequency selector-sample holder-detector to convert electromagnetic radiation to
electrical signal-recorder to produce a record of the signal-Absorption spectra-visible/ultraviolet (UV)/infrared
(IR)
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UVand IR Spectrophotometry UV and IR spectrophotometers:
-used by most labs today
-simple but no definitive results
-IR spectrum: more complex pattern
-IR spectrum- “fingerprint” of substance
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Mass Spectrometry Mass spectrometry:
-beam of high-energy electrons collide with material
-produce positively charged ions
-decompose into numerous fragments
-separated according to masses
-no two substances produce the same fragmentation pattern
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Forensic ScienceRichard Saferstein
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All Rights Reserved.67
GC and Mass Direct connection between the GC
column/mass spectrometer:
-component flows into the mass spectrometer as exits GC
-separation components by GC-fragmentation by high-energy electrons in
the produce a distinct pattern (“fingerprint”) of substance
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Forensic ScienceRichard Saferstein
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.68
Friends go together
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Forensic ScienceRichard Saferstein
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.69
A little more money
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Forensic ScienceRichard Saferstein
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.70
Still hanging together
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Forensic ScienceRichard Saferstein
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.71
A lot more money
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Forensic ScienceRichard Saferstein
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.72
A S$%*load more money!