How can a printer's ink markings be compared in CSI?

How can a printer's ink markings be compared in CSI?

Richard Saferstein (Former Chief Forensic Scientist) gives expert video advice on: What does a 'document examiner' examine in CSI?; What clues does a document examiner look for in handwriting evidence?; How is handwriting tested in CSI? and more...

What's important to look for are the general, what we call, class characteristics of the typescript; its size, a font style, the type of ink that perhaps was used to make the impression of the type. But ultimately what is critical is the existence of wear and tear patterns, or individuality characteristics that are associated with the type. Break in the type, or slight deformations in the type style that came about as a result of use - it is those individual characteristics that will lead to the ultimate identification of the type of the typing instrument.