documentation examination Flashcards
(54 cards)
what does FDE mean?
forensic document examination
what is the definition of FDE
forensic discipline in which expert examiners evaluate documents disputed in the legal system
what does ASTM mean?
american society for testing and materials
what does the ASTM do?
publishes standards for the methods
what does an examiner do for the ASTM?
makes scientific examinations, comparisons, and analyses of documents
what are the four steps for examiners in the ASTM?
- establish genuineness or non-genuineness, or to expose forgery or to reveal alterations, additions or deletions
- identify or eliminate persons as the source of handwriting
- identify or eliminate the source of typewriting or other impression, marks, or relative evidence, and
- write reports or give testimony, when needed, to aid the usters of the examiner’s services in understanding the examiner’s findings
what are the physical methods of documentation examination?
use of instruments and different light sources for the examination of the documents for different purposes
T/F: physical examinations are non-destructive.
true
T/F: chemical examinations are non-destructive.
false
what do chemical document examinations involve?
ink examination, paper examination etc.
what is the best way to view obliterated writing?
infrared luminescence
T/F: infrared reflectance and infrared luminescence will reveal obliterated writings
false, reflectance will not yield the same outcome.
what is a way to use infrared light?
for checks, the ink used to make the check and ink used to alter the check will react differently.
how will infrared images from two areas of a printed banknote change?
on a banknote at the flower is based on peak calcium carbonate.
the background pattern is based on a carbonyl peak of an ink component
T/F: the less ink that is present at the surface, the weaker the FTIR signal will be.
true
what are common destructive equipment?
LC, GC, MS, and TLC
what kind of document machines have databases?
typewriters, fax machines, or printers
what does FISH stand for?
Forensic Information System for Handwriting
what does FISH do?
database for handwriting samples from tens of thousands of writers
what does the International Ink Library do?
contains data on more than 15k inks that have been manufactured since 1920
who maintains FISH?
US Secret Service
what does fish enable for document examiners? how is this plotted?
scan and digitize an extended body of handwriting, then plotted as arithmatic and geometric values
what does the international ink library do?
chemically analyze and compare them with library specimen
what might the international ink library identify? what can they determine?
type and brand of writing instrument, can determine the earliest possible date that document could have been made