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Nov 20, 2008
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Same pen?
by: PWalla QDE

If you know it is the same pen, what is the real question? What makes you think there was a two week time lapse?

If one had a photo, photocopy, scan or fax of the original (before the purported strike over) then that would enable one to argue the alteration.

What form of document? Any witnesses? notary?

Mar 18, 2008
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writing with the same pen
by: jessy

If you write something and alter it with the same pen it is not possible to detect. If you used a different pen, you would be able to detect the difference with specific light sources. Each ink has a different response to light, such as UV-light or Infrared light.


Jessy
forensic scientist
the Netherlands

Jan 30, 2008
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Video Spectral Comparitor
by: David

The following information is taken from the Office of Crime Laboratories - Questioned Document Section.


"Altered documents can be of several different varieties. Erasures can be detected with proper lighting techniques, although identification of the original information may not be possible. Obliterations may take several forms, including the use of opaquing material, marker pens or simply using a ballpoint pen to mark over earlier writing. Special lighting and magnification techniques and the use of the Video Spectral Comparitor (VSC) can frequently reveal the information underneath the obliteration. On checks, the amount may have been altered. The VSC can reveal the presence of different inks in the amount area."

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