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The handwritten document can say much about a person, as it is said that no two people in the world have the exact same handwriting. Even if two people's handwritting is very similar, there will always be differences to pick out, whether it be the average size of a letter or one particular characteristic in a word. Handwritting analysis has been used often in forensic investigation, especially in forgery investigations. Little do most criminals know, leaving behind your handwritting is just the same as leaving behind a fingerprint.
If a document is handwritten, it can often be traced back to the one who wrote it. If samples of suspects' handwriting are taken, specialists can compare the samples and conclude whether or not that suspect produced the document. It is said that even if the criminal intentionally attempts to alter their handwriting, key characteristics will still be there in the writing. Handwriting analysis looks so closely at the design, shape and structure of letters, it can be used to tell apart even very similar pieces of handwriting.
Signatures that have been forged are usually easy to notice. Most commonly forged signatures are traces of the genuine one, and the writing tends to be quite visibly unsure. When forging a signature the writer often stops mid-signature. This lack of flowing consistency is always visible under the microscope, and sometimes even to the naked eye.
Even typewritten or printed documents can often be traced. Typewriters are not used so much these days, thanks to computers. Typewritten documents often have some form of individual marking on them, meaning tracing the origin of the document may be easier. Whether it be a manufacturing mark, a non-matching replaced key, or a particular brand of paper, there are almost always ways of tracing documents from their original origin.