William The Coroner’s Forensic Files

Wednesday, 7, September, 2011

Graduate School #4 Identity

Filed under: Forensics,Teaching — williamthecoroner @ 14:24

Identity
Presumptive vs. Scientific
Bias against presumptive methods
State of Preservation
Undecomposed vs. decomposed vs. skeletonized

Presumptive–most common
Driver’s license/Work ID/Passport/National ID card (Non-US)
What it is for
Logic: Whose house is it? Who hasn’t shown up for work? Whose car is it?
Elimination: Cajun pilot; UH helicopter

Scientific
Fingerprints:
Since 1890. NY system, 2 guys, same appearance, same name, different prints. Fingerprints form in utero. Lot of people over 18 have been fingerprinted. Military, licensing, prison. Children fingerprinted. Last for years–mummies. Paper dry
3 principals:
A unique identifier
Doesn’t change over person’s lifetime
Classifiable patterns
Alter–burn off with acid, graft skin over, wear gloves.
Foot prints and palm prints

Dental records
Fillings are unique-made to fit the specific hole
Compare antemortem records to postmortem records
Compare antemortem radiographs to postmortem radiographs
Known problem: Record comparisons work best with middle class folks. Inaccurate with very rich and very poor. Rich show less work than body, poor show more work than on body. Ask them why

Radiographs
Unique anatomic structures
Frontal sinuses
Surgeries
Souvenirs

Medical Devices
Pacemakers, defibrillators
All devices have a unique identifying number; manufacturer has to keep records for the FDA. Makes life easier for me. Can be seen radiographically Call Medtronic or whomever

Laboratory
Blood groups
Mendelian inheritance, A & B codominant carbohydrate antigens
44% 0, 40% A, 10% B, 4% AB white population
Secretors Lewis blood group
Loads of blood groups, ABO, Rh, MNS, Kidd, Kell, Duffy, Lutheran etc.

DNA
Powerful techniques, highly specific. Highly expensive
Restriction Fragment Length Polymorphisms–RFLP
Short Tandem Repeats STR
Mitochondria
Buccal swabs, blood on filter paper

Charred, skeletonized
DNA from bone/dental pulp Frank in the box
DNA Long Island Sound bodies

Paternity
Save blood sample indefinitely
Court order
Drives me absolutely crazy

1 Comment »

  1. I have to admit, my curiosity is piqued by the Cajun pilot and the Frank in the box.

    Wish I could audit your class from here!

    Comment by Auntie J — Wednesday, 7, September, 2011 @ 21:21 | Reply


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