Aldy Way

Suppose crimes investigator came to the document as a ransom note or a suicide note that was copied in an attempt to hide the perpetrators of the manuscript, the manuscript he used, or mechanically text. How can I ensure that it copied a piece of paper came from a particular copy machine?

In this article, I'll try to explain how forensic document analysts found that the relationship between the paper machine that produces a copy.

a copy machine has the ability to duplicate images from a single piece of paper to another through a complex sequence of events. First of all, the lens focuses an image on an original work of what is known as a drum that is charged with electrons and coated with selenium or other substances that could be sensitive to light. image is then retained on the drum as the drum is coated with toner powder. toner powder sticks to the drum surface in direct relation to the power level of electrostatic charge of electrons. The toner image is then copied to a blank piece of paper (or copy) which, in turn, is exposed fixing agent. fixing agent, a chemical used to "snag" the toner powder permanently to a blank piece of paper.

For the purposes of forensic document analysis, criminal investigators sometimes can connect photocopied document particular copy machine making a comparison document to compare against a photocopy. This is due to the fact that the mechanisms within the machine that drag on the paper and remove it from the surface up to leave distinctive marks on paper. Similarly, the camera lens, cover glass, or the drum surface may have scratches, etches, or abnormalities that mark each copy to be created. From time to time, these tags appear on the paper copy. Forensic scientists can then identify and connect the marked copy of the copier that was created, and perhaps to the offender.

With advancing technology, forensic scientists have many tools in a bag of tricks to link the suspect to the crime.