What is Forensic Science?
How did they know?
"Strong evidence
Based upon forensic science
Scientific principles
1
What is Forensic Science?
Interpretation
Evidence
2
What is Forensic Science?
1
Interpretation of evidence
Found at crime scene
Physical objects or measurements
3
What is Forensic Science?
Interpretation
Reliability
Evidence
4
What is Forensic Science?
2
Reliability of evidence
How evidence can be trusted
To what extent it can be trusted
DNA very reliable
5
What is Forensic Science?
Interpretation
Cannot be
Reliability
Evidence
deduced
Can be
deduced
6
What is Forensic Science?
3
Can / cannot be deduced from evidence
Some aspects beyond the
power of forensic science
Limits of forensic science
7
Why Science?
Philosophy of all science
Newton
Observations
Natural world /
crime scene
Experiments
8
Why Science?
Observations
& Experiments
Theory
Isaac Newton
9
Scientists
Theory
Scientific paper
Presentation at
a conference
10
Forensic scientists
Theory Present theory in court
Expert Witness
Convince judge / jury
Wrong theory
Send an innocent
person to prison / death
11
Procedures in a case
Evidence from:
Prosecution
Experts
Verdict
vs Defense
Witnesses
Police
12
Verdict given by
Judge
Judges
13
Verdict given by
Judge
Jury
Local citizens
Abolished in
Jury
some countries
14
Presumption of Innocence
Innocent until proven guilty
Prosecution has to prove guilt
Defense does not have to prove innocence
Reasonable doubt
15
Presumption of Innocence
Innocent until proven guilty
beyond reasonable doubt
16
Felicia Lee
17
September 2009
Felica Lee found dead
Autopsy
18
Autopsy results
Over 300 blunt force trauma wounds
Randone charged Murder
Torture
19
Trial
1
Prosecution
Torture: Kicked
1
by Randone
Cause of death:
2
Asphyxia by
smothering
20
Autopsy results
Standard tests
Other possibilities
causing death
Blood chemistry
Felicia Lee s blood contained
gamma-hydroxybutyrate (GHB)
21
Trial
2 3
1
Defense
Verdict
Prosecution
Expert witness
Torture: Kicked Not
1
by Randone guilty
Cause of death:
1
Seizure caused
Cause of death:
2 by GHB
Asphyxia by
smothering
22
Verdict
Did defense prove Lee s death
was caused by a drug overdose?
No
Suggested a reasonable possibility
23
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