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WARM UP #5 1/31. What is entomology? What is odontology? THINKING: 3. Think of reasons why witnesses are not always reliable for helping with a case. 4. What percent of the time do you think witnesses get things wrong? 5. Why do you think that forensics is needed?.

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warm up 5 1 31
WARM UP #5 1/31
  • What is entomology?
  • What is odontology?

THINKING:

3. Think of reasons why witnesses are not always reliable for helping with a case.

4. What percent of the time do you think witnesses get things wrong?

5. Why do you think that forensics is needed?

ch 1 notes 3 1 31

Ch 1 NOTES #3 1/31

Why Forensics?

slide3
Two types of evidence:

1. Eyewitness

2. Physical evidence

witnesses
Witnesses
  • Until the 1900’s – testimony was most relied on
  • Many people wrongfully accused
  • Studies show witnesses not very reliable

(25-45% time wrong)

eyewitness accuracy
EYEWITNESS ACCURACY

Wells (1998)

  • Studied 40 people convicted, but later cleared by DNA
  • 36 (90%) of the cases, there were false eyewitness ID
slide6
Buckhout
  • Simulated a crime on a TV newscast
  • Asked for callers
  • 2,145 callers - 85% of the callers had the suspect description wrong!
slide8
Buckhout
  • Staged assault on professor in front of 141 students
  • Week later, students showed a line up:

- 36% IDed a person next to the attacker

- 23 % IDed a person not there

- 40% got it right

slide9
Wells and Bradford (1998)
  • 352 people shown a grainy video of a murder of a security guard
  • Then gave them each a line up of suspects that were not on the tape
  • 58% picked out a suspect
why do people get it wrong
WHY DO PEOPLE GET IT WRONG?
  • Emotional stress of the event
  • Pressure to choose or help
  • Not actually notice or see things

(eyes can trick you too)

4. Hard to id different race / gender details

when using eyewitness testimony separate fact from opinion
When using eyewitness testimony,Separate FACT from OPINION
  • What did the witness actually see ?
  • Did they see it correctly?

What we think we see and what we really see might not be the same

slide27

Your eyes are making them move. To test this, stare at one spot in each picture for a few seconds and everything will stop moving

why need forensics
Why need forensics?
  • to find and interpret REAL evidence; to give SOLID PROOF
you saw a crime scene earlier
You saw a crime scene earlier
  • Describe all you can about the suspect

Most people only see about 3-5 seconds of a crime scene!

the innocence project
THE INNOCENCE PROJECT

Started in 1992

Reopen cases where people claimed they were innocent and the main evidence was eyewitness testimony

Use DNA evidence to give conclusive proof

* 174 out of 200 cases where eyewitness testimony was the main reason for conviction were exonerated (cleared)!!!

Several were in jail over 15 years!

slide46
1 How many green?

2 How many blue?

3 How many red?

4 How many in squares?

answer each question below
Answer each question below.

1. What color coffee mug was in the picture? Blue Red Yellow

2. When was the deadline? Yesterday Today Tomorrow

3. What time was on the clock on the wall? 10:40 11:05 1:55

4. How many sticky notes were on the whiteboard? Four Six Eight

5. Which of the following was NOT in the picture? Stapler Trash Can Printer

6. What was the name on the plaque on the desk? Bill Brian Carl

7. What color was the victim's shirt? Black Blue Red

8. How many plants were in the picture? None One Two

9. What was the color of the marker in the desk drawer? Red Blue Green

10. Where was the book in the picture? On a box In the trash can Under the body

Source: http://forensics.rice.edu/html/picture_begin.html

let s test your witness ability
Let’s test your witness ability!

Get out a scrap sheet of paper and put your pencil/ pen down

You will get 10 seconds to look at the items

You will write as many as you remember when done.

witnesses can help by
Witnesses can help by:
  • A place to start investigations
  • Useful information about crime
  • Making themselves a suspect (lying)