ABIO EXAM 3 Flashcards
what is rimfire
Round of ammo is complete.
No cartridge pin
Rimfire has the priming compound in the rim of the cartridge.
Cartridge is self- contained allows fast reloading, repeating action, reliability
extractor mark
left on the rim of the spent casing
breech face mark
found on the head stamp of the casing
firing pin mark
left on the middle of the primer
breech face
The area around the firing pin, which is against the head of the cartridge during firing.
Calvin Goddard, with Charles Waite, Phillip O. Gravelle, and John H Fisher
perfected the comparison microscope for use in bullet comparison.
grooves are smaller than lands
to match a bullet to a barrel
Look at the grooves on the top of the barrel. e.g, These grooves go from left to right. (twists to the right)
nd match to the grooves of the bullet that’s closest
Gun Control Act of 1968
All guns produced in the USA or imported must have a serial number
Acid serial number recovery
method
Sand the surface smooth.
Add a strong acid evenly across the surface
then the Density of the metal surrounding the imprinted serial number etches slower than the surrounding metal
Magnetic serial number recovery method
Polish the surface of the metal smooth
Add Iron oxide power in oil
narcotics
Psychoactive compound with sleep-inducing properties
Hallucinogens
Alteration in normal thought processes, perception and moods
Depressants
slow down or depress the central nervous system
Lower blood pressure, heart rate and respiratory depression,
Stimulants
speed up the central nervous system
steroids
human growth hormone
color test
React with chemical groups to produce a color change(marquis test)
Thin-layer chromatography
Unknown samples are compared against standards
Can be used to identify a mixture of drugs
requires a reference sample
Gas Chromatography
Separates mixtures
Compounds I.D. by retention time (Retention time – How long it takes for a compound to pass through the gas chromatogram)
requires a reference sample
Infrared Spectroscopy (IR)
Measures the light wavelengths absorbed by a compound
databases required for use
Mass Spectrometry
Analyzes samples by mass
No reference/Uses database
Illicit Labs- what are forensic chemists looking for
Precursors (a compound that participates in a chemical reaction to produce another compound) , Active reactions and Leftover materials
Bob Paillet
Owners of Purdue Pharmaceutical. This family implemented
policies resulting in the addiction of patients to opioids
Developed a simple method for the synthesis of
methamphetamine and shared this method with a Texas biker gang
Sackler family
Owners of Purdue Pharmaceutical. This family implemented
policies resulting in the addiction of patients to opioids
the medical examiner in NY in 1920
who standardized toxicology conducted during autopsy examinations?-
Charles Norris
Forensic Toxicologist – Identify drugs, poisons and toxins, but are limited to matters that pertain to violations of criminal law
What organ eliminates the majority of alcohol from the body
liver
Two methods to determine BAC (blood alchohal control
breathalyzer (Determines the BAC level base on the amount of alcohol in a persons breath)
, used by the police and gas chromatography, used by toxicologists
fuel cell (breathelyzer)
Alcohol is required to complete the circuit of a fuel cell battery
More alcohol = more current
Current determines BAC
Infrared Detector (IR)
Band intensity determines the BAC
Gas Chromatography
GC Peak volume is proportional to the concentration
What compounds are toxicologists trying to identify? Drug Metabolites
Samples of blood must be preserved before and after testing
Must be a preservative and anticoagulant
What evidence provides clues to who killed Mary Yoder?
fake email
user dictionary ( words used in messages
