1. FS Fall Final Review

2. Ch 1 and 2 observations and CSI
Forensic investigators recognize, document, collect evidence left at the scene of a crime. Factors that affect observational skills such as emotion, perception and recall,time of day, level of interest, number of people…
DOCUMENT DOCUMENT DOCUMENT

3. How does your brain work?

4. Your brain…
Filters (what is important, what you notice, your level of interest, who you are with, where you are….)
Fills in gaps (D yo kno wht I mn?)
Applies previous knowledge –connect with what you know so it makes sense

5. Scientist
Galton
Locard
Landersteiner
Bertillion

6. Direct vs Indirect Circumstantial

7. Class vs Individual Blood type-A B AB O Shoe or tire impression Hair
Fingerprint
DNA
Bitemark
Hair follicular tag

8. Physical Evidence

9. Trace

10. Who does what? Who secures the scene and separates witnesses?
Who takes measurements and notes location of evidence?
Who interviews the witnesses?
Specialists?

12. First Find, then

13. NOTES-WHY??
Write brief, legible, abbreviated notes that others will be able to understand.
Notes in INK
Bound notebook
Mistakes crossed out with single line
Pages numbered consecutively
Pages initialed

14. Why secure the scene?

15. Primary vs Secondary Crime scene

16. Crime Scene Team Police Officers (First Responders)
Usually first at scene
Secure Scene
Crime-Scene Investigators
Document crime scene in detail and collect evidence
Recorders, sketch artists, photographers, evidence collectors
Medical Examiners (Also known as coroners)
May be present to determine the cause of death if a homicide or “possible” homicide occurred.
Detectives
Look for leads
Interview witnesses
Forensic Specialists
Certain crime scenes may call for experts in certain areas to be on scene
Example – entomologists, anthropologist, toxicologist, odontologist

17. Identify the regions of hair

18. What part of the hair is shown?

19. DNA?

20. Human or NON-human Cuticle?

21. Consistent? Dissimilar? Inconclusive?

22. Is Hair CLASS or INDIVIDUAL evidence?

23. Medulla

24. Locard
Every contact leaves a trace
Duration
Intensity
Materials used

25. Control?

26. Fingerprint Minutiae

27. Fingerprints 1. unique 2. unchanging 3. can be used to ID individuals
arches, loops and whorls
Principles of Fingerprints
1. unique
2. unchanging
3. can be used to ID individuals

28. Kinds of Crime Scene Prints
Patent /Visible prints –
bloody, muddy, dirty….
Plastic Prints –
ridge impressions left on a soft material (putty, wax, soap or dust)
Latent/invisible prints –
Must be LIFTED
Porous-ninhydrin, iodine
Nonporous-powder

29. Identify each fingerprint pattern.? A B
Right Hand
Left Hand C
Right Hand E D
Right Hand
Left Hand 29

30. How can we use these?

31. What Can be learned from tire impressions?
What type of impression is shown?

32. What can you learn from studying the gait (walking pattern)

33. Fire Classification
Accidental
Natural
Intentional -Arson
undetermined

35. COMMON MOTIVATIONS FOR ARSON
$$$-insurance fraud, for profit
Revenge, spite, jealousy
Vandalism/malicious mischief
Racial/religious hostility
Crime concealment/diversionary tactics
Psychiatric afflictions
Vanity, hero fire

37. Glass as evidence By analyzing the fracture patterns:
1. what object hit the glass
2. from which direction the object came
3. sequence of events
4. composition of specialized glass

38. Why is Chain of Custody so important?

39. Questioned Documents Checks Passports Driver’s license Prescriptions
Wills
notes

40. Fraud vs Forgery?

41. Exemplars (Control)