1.What is the function of the ridges on our fingers which create fingerprints? A. They enable us to grasp objects. B. They provide insulation for the tissues

1. What is the function of the ridges on our fingers which create fingerprints?

A. They enable us to grasp objects. B. They provide insulation for the tissues under the skin.C. They help us to identify individual human beings.

2. At what age do human beings acquire fingerprints? A. At three month's gestation C. At birthB. At six month’s gestation D. At three months of age

3. What is the minimum number of matching points required to identify an unknown latent print in the United States? A. 12 B. 16 C. 32 D. There is no minimum

4. In 1910, Thomas Jennings became the first person in the United States of America to be convicted on fingerprint evidence. What was his crime?A. Kidnapping B. Forgery C. Bootlegging D. Murder

5. Who was responsible for starting the first national fingerprint register in America in the 1920's?A. Herbert Hoover B. Calvin Coolidge C. J Edgar Hoover D. August Vollmer

1. What is the function of the ridges on our fingers which create fingerprints?

A. They enable us to grasp objects. B. They provide insulation for the tissues under the skin.C. They help us to identify individual human beings.

2. At what age do human beings acquire fingerprints? A. At three month's gestation C. At birthB. At six month’s gestation D. At three months of age

3. What is the minimum number of matching points required to identify an unknown latent print in the United States? A. 12 B. 16 C. 32 D. There is no minimum

4. In 1910, Thomas Jennings became the first person in the United States of America to be convicted on fingerprint evidence. What was his crime?A. Kidnapping B. Forgery C. Bootlegging D. Murder

5. Who was responsible for starting the first national fingerprint register in America in the 1920's?A. Herbert Hoover B. Calvin Coolidge C. J. Edgar Hoover D. August Vollmer

He was director of the FBI for almost 48 years (1924 until his death in 1972). The FBI's fingerprint data base is the largest one in the world.

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Objective

• SWBAT test carpet collected at the crime scene for the presence of blood.


Agenda

1. Evidence Handling

2. Detection Lab – Part 2

3. Post Lab Analysis Questions

4. Forensics of Blood Article

5. Exit Slip


Evidence Handling

• It is crucial that bloodstains found at a crime scene are documented, collected, tested, preserved, and analyzed correctly.

• Failure to do so will weaken or destroy potential evidence.


Evidence Handling

• Proper evidence packaging is crucial to protect against:– Loss– Contamination– Deterioration– Cross-transfer

• Suspect / scene / item / victim

– Biohazards


Evidence Labeling

• Labeling– Evidence description– Source (location, agency)– Chain of custody– Case and item numbers– Health hazards– Storage conditions (room temp, frozen,

refrigerated)


Evidence Labeling

• Biological material must be dried before packaging to prevent deterioration.– Dry at room temperature, do not use a heat

gun, fan, or hair dryer.

• Use paper containers for biological evidence.

• Seal evidence with tape across the bag, initial and date over or under seal.


Evidence Packaging

• Work on clean surfaces. Wear gloves, a mask, and eye protection – don’t contaminate with DNA.

• Change gloves after handling each sample to eliminate cross-contamination.

• Do not blow on samples to make them dry faster.

• Do not touch blood samples with any non-disposable items.

• Clean tools with 10% bleach solution and dry thoroughly.


Evidence Packaging

• Keep all stains separated.

• Separate stains on the same garment with sheets of paper.

• Package multiple garments in different bags.

• Do not use any packaging that limits air exposure (tubes, parafilm, plastic baggies)


Evidence Storage

• Biological evidence should be stored dry to prevent bacteria or mold growth.

• Wet evidence should be stored frozen.

• Some portion of samples should be preserved from destructive testing.



Detection – Lab 2

• Follow the directions and complete the data collection sheet as you are working

• When you are finished – make sure you work on the Post Lab Analysis Questions


Forensics of Blood Article

• Read pages 4 – 7 and write a summary of at least 3 full sentences.


Homework

• Blood Spatter Pre-Lab Questions due Wednesday


Exit SlipNovember 18, 2014

• Go to m.socrative.com and enter 417101• Question: What did your group

conclude about the stain on the carpet?

Documents

1.What is the function of the ridges on our fingers which create fingerprints? A. They enable us to grasp objects. B. They provide insulation for the tissues