forensics intro

8/8/2019 Forensics Intro

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Prepared By:

Jessica Perez

Jessica Tejera


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Crime Labs

Public Funded (Federal, State,or Local)

Used by:

-Police

-Prosecutors

-Other Law Enforcement

Privately Funded

-Charge a fee for services


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PHYSICAL SCIENCE UNIT:

-Examines drugs, glass, paint,

blood spatters and other traces

of physical evidence.

*It uses Chemistry, Physics, and

Geology


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FIREARMS UNIT:

-Examines tool marks, weapons,

firearms, and bullets

*Uses Ballistics:

-The science that deals withmotion, behavior, and effects

of projectiles, specifically

firearms and bullets.


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DOCUMENT ANALYSIS UNIT:

-Examines handwriting,

typewriting, word processing

and computer applications,

papers, and inks.

*Uses chromatography for ink

analysis.


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BIOLOGY UNIT:

-Analyzes body fluids, DNA, blood factors,

hair, fibers, and plant life.

*Uses Biology, Biochemistry, and

Microbiology

Includes:

-Forensic Photography

-Toxicology

-Latent Fingerprints

-Polygraph Unit


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ANTHROPOLOGY: the study ofremains; bones

ODONTOLOGY: examines

bite marks, dental

identification

PATHOLOGY: investigatessudden violent and

unexplained death.

GEOLOGY: the study of soil

and minerals


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FBI (Federal Bureau of

Investigation):

-Has the largest crime lab in the

world.

-The Cryptanalysis unit of the FBI

works with documents found at thescene of a crime.

-The Drug Records Examination unit

analyzes any drug records that a

suspect may have.


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DEA (Drug Enforcement Agency):

-7 crime labs across the country.

-Investigate major illicit drugactivity in and out of the country

as well as in criminal cases.

-May also aid local law enforcement.


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ATF (Alcohol, Tobacco, and

Firearms Bureau):

-3 regional labs- Deals with crimes involving

alcohol, weapons, explosives,

tobacco, and organized crime.


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IRS (Internal Revenue Service):

-Maintained by the Department of

Treasury

-Specialize in questioned

documents

-An IRSSpecial Agent is

basically a forensic Accountant

that deals with money.


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USPS (United States Postal

Service)/OIG (Office of

Inspector General):

-United States postal service

has their own lab for crimes

committed through the mail.


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US Fish and Wildlife Service:

-Maintain their own lab for

crimes committed in national

parks as well as crimesinvolving the animals. This

includes poaching and harming

of endangered species.


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Department of Homeland Security:

-2 secret service labs

-One lab guards against

counterfeiting-The second lab provides

research for executive

protection


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O.J. Simpson Case WHO: O. J. Simpson

WHAT: Accused for

the murder of Nicole

Brown Simpson andher friend Ronald

Lyle Goldman.

WHEN: June 12, 1994

CONVICTION:


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In the O.J. Simpson case, O.J. was accused for

the murder of his ex-wife Nicole Brown Simpson and her

friend Ronald Lyle Goldman. While Nicoles body was

being examined, Dr. Lee a forensic scientist noticed

blood stains on her back that did not pertain to her,implying that the LAPD did not collect all possible

evidence. The uncollected evidence also included a

second foot print that was also found at the crime scene

that could have been linked to an assailant. It is said

to believe that O.J. Simpson sliced Nicoles throat

while using a knife found at the scene of a crime.

Units of Forensic Science that were used:

-Firearms Unit

-

PhysicalS

cience Unit-Biology Unit


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Murder of Selena

WHO: Selena

Quintanilla Perez

WHAT: She was Shot to

death by the president

of her fan club,

Yolanda Saldivar.

WHEN: March

31, 1995

CONVICTION:


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Unit of Forensic Science that were used:

-Firearms (Ballistics) Unit

On March 31, 1995, Selena was

shot to death by the president of

her fan club Yolanda Saldivar. The

forensic science unit that was

involved in this case was the

Ballistics Unit to figure out what

gun Saldivar used to murder Selena.


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Quiz

1.You arrive at a crime scene

and you find a mysterious

white substance that you

suspect to be Cocaine. What

unit of forensic science would

you use to test this powder?

Physical Science Unit

(Toxicology)


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Quiz

2. If a bullet casing was to be

found at the scene of a crime,

what unit of forensic science

would you use in order to

figure out what kind of gun it

came from?

Firearms (Ballistics) Unit


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Quiz

3. What department of forensic

science deals with drugs?

DEA (Drug Enforcement Agency)


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Quiz

4.What is the study of sudden

and unexplained death?

Pathology


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DEMONSTRATION:

Glass


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forensics intro

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