At AAU we use scientific principles in our field. Submitted signatures and or
 
items are examined with regard to its writing surface, writing instrument,
 
ink comparisons and area measurements. Our examinations are conducted
 
using ultraviolet and infrared lighting as well as using a stereoscopic
 
microscope. We consider cases on contracts, wills, deeds, bank checks,
 
leases, applications, anonymous letters, etc., for signatures, handwriting,
 
handprinting, numerals, writing instruments, typewriter typefaces etc.
     
    It is true that in certain cases, not all of the above scientific procedures are
 
required. A significant difference between legal questioned document work
 
and autograph-historical documents are how exemplars are obtained. In Q.D.
 
cases, forensic document examiners obtain samples from the attorney-client
 
or adversary. The written evidence can be either requested (taken personally
 
by the examiner) or collected (documents previously written). It is imperative
 
that the examiner ascertain the integrity of these samples to conclude like or
 
different authors.
 

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