1. Forensic Science Unit Four
Mrs. Pearson’s First Semester Forensic Science
Forensic Science Unit Four
*For those watching by recording, watch for questions on the slides throughout the presentation. me the answers to the questions within two days of the lesson being presented in order to receive credit for watching the recording.

2. Fingerprints-what do they tell us?

3. Bodily Fluids http://www.youtube.com/watch?v=hUQ4LtDs bRo
If you find a great link you’d like to share, please send it to me! 

4. So what do you need to know to be successful on the assignment?
The three basic patterns of fingerprints and how often does each occur
The definition of a medulla and what scientists use it for
What is a precipitin test and what is it used for
What makes fingerprints individual and how is a match determined
How are fingerprints found at a crime scene
What physical evidence is most important at a crime scene and why
The importance of blood stain patterns
The importance of the bite marks in the Bundy case

5. Lets begin with how to get a fingerprint at home and in the world
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6. Fingerprints Good source of evidence Remain the same your entire life
Unique to each person
Easy to catalogue in a
system
Can be left on nearly
anything
**Those watching by recording, include in your three reasons why fingerprints are a good source of evidence.

7. History of Fingerprinting
Can be traced back to India, Babylonia, Nova Scotia, and China
The first prints taken in the US were in the 19th century
Were studied using magnifying glass
The case of the People vs. Jennings in established fingerprinting as a legal method of identifying people
Fingerprints still solve 10 times more cases that DNA

8. Latent Prints Can be either negative or positive
Can be studied in two ways
Oblique lighting- shining the light at an angle to reflect the print
Powder copy
Various types of powder
are used

9. Collecting a Print Latent print Power is applied Chemical is applied
Brushed, blown, or poured on
Different types of brushes are used based on the location of the print
Chemical is applied
Makes prints visible on absorbent surfaces
Can reveal even invisible prints
**Those watching by recording, include in your what type of surface chemicals are used on to reveal fingerprints.

10. Documenting a Fingerprint
Proper steps
Photographed with ruler
Taken to lab, if possible
Item is not wrapped, but is placed in secure box to avoid smudging the print
If item is too large or stationary, the print is lifted using tape and place on a card to transport back to the lab.
Determine a pattern and study individual characteristics (minutiae)
Must have 8-16 points of comparison to be considered a match

11. Fingerprint Patterns 3 basic patterns Arches
Tented- ridges flow from one side to the other but are interrupted by a ridge
Plain- ridges flow from one side to the other without interruption

12. Loops – a ridge that goes out the same side it entered
Must have only one delta
Whorls- a ridge that contains 2 or more deltas and recurves back on itself
Plain
Central pocket
Double loop
Accidental

13. Labs Fingerprints Lost Mine
What should you do before completing the labs?
Read the lessons
When you submit the answers, what are you going to be sure your paper contains?
Both the questions and answers
Complete sentences
Proper grammar and spelling

14. Explore a Career Jennifer Hannaford
Teachers' Domain, Jennifer Hannaford, published September 18, 2007, retrieved on September 12, 2010, .systems.hannaford/

15. That’s a Wrap! New means of gathering fingerprints are being developed
Fingerprints are unique to each person
Whorls, loops, and arches
Latent fingerprints can be recovered using powder or lighting
Documenting of fingerprints follows specific guidelines
When submitting work, remember spell and grammar check, include the questions with the answers and name your file as described in the course announcements!

16. Need Help?