Forensic Document Question

by Joaquim
(Portugal)

Photo Credit Sergei Vavinov

Photo Credit Sergei Vavinov

Suppose that you have a word in a document, for example "DNA". Later, a week or two, you write over the letter D, with the same pen, and transform this letter into a B, that is, you obtain the word "BNA".


Question: How can you prove, on several ways, that alteration on a document?

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