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Advances in Forensic Science
Transcript of Advances in Forensic Science
Advances in ForensicSciences
Mitch Morrissey and Gregg LaBerge
A field of science dedicated to the methodical gathering and analysis of evidence to establish facts that can be presented in a legal proceeding.
Other Forensic Sciences
Linking Cases to Suspects
Linking Cases to Cases
DNA - CODIS
Fingerprints - AFIS
Ballistics - IBIS
Reconstruct a Scene
Catch Serial Criminals
Provide Evidence When the Victim Cannot
Support Witness Credibility
Defeat An Alibi
Force a Defendant into
Prosecute “Upstanding” Members of the Community
Claims of Innocence and Exonerations
Forensic Composite Art
Forensic Image Enhancement
Blood Stain Pattern Interpretation
Tool mark Examinations
Rope & Cord Examinations
Advances in Forensic
Forensic Photography Systems
DNA and Fibers from the Victim found on the undercarriage of the car.
Identifying Homicide Victim’s Remains
Case Study - Home Invasion Robbery
750 S. Harrison
Victim Eventual Identifies the Defendant
2900 E. 31st Ave
The major source of both blood stains match the defendant
1 in 150 trillion - Defendant’s DNA
Minor source - victim cannot be excluded 1 in 1,700
Victim's car and others items were stolen from the home.
Scientific evidence must be "generally accepted" by a meaningful segment of the associated scientific community.
Rejected by the U.S. Supreme Court in the Daubert case.
Frye is still in use by 13 states.
Frye Test (1923)
Non‐exclusive reliability checklist for courts
(1) Whether the expert’s technique or theory can be or has been tested.
(2) Whether the theory or technique has been subjected to peer
review and publication.
(3) The known or potential error rate of the technique or theory
(4) The existence and maintenance of standards and controls.
(5) Whether the theory or technique has been generally accepted
in the scientific community.
Used in all federal courts and has been adopted by 11 states.
Daubert Standard (1993)
If scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise, if
(1) the testimony is based upon sufficient facts or data,
(2) the testimony is the product of reliable principles and methods,
(3) the witness has applied the principles and methods reliably to the facts of the case.
Rule 702. Testimony by Experts
Designed to be a “liberal” standard
Legal Admissibility Tests for Forensic Evidence
Green Cloth Gloves
The victim could not be excluded from the mixture of DNA found in the blood stain from the outside index finger of one of the gloves (1 in 83,000).
Victim's TV and DVD
The victim identified the defendant
The DNA evidence
The footprint evidence
The evidence in her car - DNA and receipt
The evidence from the King Soopers - video and cigarettes
The evidence found in the defendant’s house - TV and DVD player, shoes, gloves and cell phone.
The cell phone and supervision records
The defendant cannot be excluded from the mixture of DNA found in the shoes
Right Shoe - 1 in 100,000
Left shoe - 1 in 5,300
It All Fit
Cell Phone Data for June 16, 2008
A call before and after the crime.
Tower 5 blocks away
4 calls while at the store
5 blocks away
Trace Evidence Examinations
Hair, Fiber, Glass Examinations
Call on tower 8 blocks away
Tower 11 blocks from where the victim's car was found
between 6:00PM and 6:15PM
8 blocks away
The source of both blood stains match the victim
1 in 25 trillion - the victim’s DNA
The major source of both blood stains match the defendant 1 in 150 - Defendant's DNA
Minor Source - victim cannot be excluded 1 in 1,700
The defendant cannot be excluded from the mixture of DNA found in the shoes:
Right Shoe - 1 in 100,000
Left Shoe - 1 in 5,300