Answer to Question 1
A TTI, or transmitting terminal identifier, is a header at the top of each page of a fax document. It is useful in document comparison because it serves as a way to distinguish between a real and a fraudulently prepared fax document. Investigators also use it to determine the model of fax machine that produced the document.
Answer to Question 2
Transitory defect marks originating from random debris on the glass platen, inner cover, or mechanical portions of a copier produce irregularly shaped images that may serve as points of comparison.
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