[Forensic Autograph Authentication | Methuen, Mass 01844 Here at Forensic Autograph Authentication we utilize old school authentication such as consistent considering slant , flow , pen pressure, letter size and other characteristics that are typical of the exemplars that we have on file, Forensic Autograph Authentication only employs forensically trained experts with a diverse knowledge and years of professional experience to examine your signatures.ed. At Forensic Autograph Authentication we’ll give you the attention and personal service you’ll come to expect and enjoy. We offer the best in on line authentication along with in person . Forensic Autograph Authentication has been located in Methuen Mass since 2000. Let us put our experience to work for you.]