HOSA: Forensic Science Study Guide |2025
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Forensic History and -
Careers
(1787-1853) Founder of forensic toxicology, studied
Mathieu Orfila poisons and worked on the Marie Lafarge poisoning
case
(1822-1911) Developed the first classification system
for fingerprints, published the book Fingerprints in
Sir Francis Galton
1892 and described the loop, arch and whorl of
fingerprint patterns
(1847-1915) A generalist who believed in diverse
approaches to forensic science and published the
Hans Gross
first forensic science textbook, Criminal
Investigations, in 1893.
(1852-1950) Paris Medical Examiner who advanced
fingerprint, firearm, and hair analysis, showed that
Victor Balthazard
fingerprints are unique to the 10^60 and used
photography to help identify bullets
(1853-1914) Developed anthropometry and was the
Alphonse Bertillon
first to solve a case using fingerprints
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(1877-1966) Established a forensic lab in Lyons
Edmond Locard France in 1910, founded the Locard Exchange
Principle and focused on trace evidence
(1891-1955) Established the study of firearms
Calvin Goddard evidence in the US, established a variety of police
labs in the US and invented the comparison scope.
System of identification of suspects involving 11
Anthropometry
body measurements + descriptions + photos
Criminalistics Describes forensic analysis of physical evidence
Locard Exchange Every contact leaves a trace
Principle
Juan Vucetich (1891) Began the first fingerprint files
The Henry Classification Classification for fingerprinting in all European
System Countries
Sir Francis Galton's odds for two fingerprints being
1 in 64 billion
the same
The Scientific Method System in which forensic scientist work
The adversarial system System in which lawyers work
finder of fact Judge or jury who determines "right" in a case
Occur between individuals and must show a
Civil Cases
preponderance of evidence (51%)
Occur when laws have been broken, the
Criminal Cases government in the prosecutor and and guilt but be
shown beyond a reasonable doubt (99%)
In a serious criminal case, the possibility of greater
Felony
than 1 year in prison.
A minor criminal case, possibility of a fine or less
Misdemeanor
than 1 year in prison.
vior dire Qualifications of a scientist given in a court of law
A statement requiring someone to appear in court
subpoena
and stating when and where the trial will be held.
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(1882) Who used fingerprints officially in the US for
Gilbert Thomas
the first time
(1880) First to come up with a classification system
Dr. Henry Faulds
based on fingerprints
When the first criminal fingerprint identification was
1892
made
When the idea of fingerprinting was introduced to
1901
England/Wales
Discovered that blood can be grouped into
Karl Landsteiner different types, A, B, AB and O, and received the
Nobel Prize in medicine for this work in 1930.
Alec Jeffreys Geneticist who developed DNA testing
Colin Pitchfork The first criminal convicted by DNA evidence
Trained to treat trauma patients (assaulted), take
Forensic Nurse blood and tissue samples, collect evidence,
photograph and measure wounds.
The first to use fingerprinting as a method of
William Hershel (1856)
identification
Crime Scene and Death -
Investigation
primary crime scene The original location of a crime or accident
Secondary Crime Scene subsequent crime scenes
macroscopic crime scene the broad crime scene
Microscopic crime scene the smaller crime scenes in the broad crime scene
linkage of persons, scenes, or objects; investigative
Types of information that
leads; information on the corpus delicti; information
can be obtained from
on the modus operandi; proving or disproving
forensics testing and
witness statements; identification of the suspect(s);
examination of physical
identification of unknown substances;
evidence
reconstruction of a crime
A crime must be proved to have occured before a
corpus delicti
person can be convicted
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