In Forensic Handwriting Analysis – Expert Introduction to Handwriting Analysis, documents and handwriting expert witness Mark Songer writes that “the science of handwriting analysis is based on the premise that no two individuals can produce exactly the same writing and that an individual cannot exactly reproduce his own handwriting, otherwise known as variation. Variations are natural deviations that occur in a person’s handwriting.”
The first step is to analyze the known writing sample and the unknown writing sample for distinctive characteristics. The examiner looks for unique qualities such as letters and word spacing, letter and word slant, size and proportional-ity of letters, unusual formations of letters, flourishes, and other individual attributes.
2) Comparison The next step is to differentiate elements from the known sample to those of the unknown sample. The examiner considers spelling, grammar, punctuation, and phraseology as well.
3) Evaluation The final step is to evaluate the similarities in the known and unknown samples. While differences are a good indication of a non-match, no single similar characteristic, no matter how unique, can determine a match. Therefore, all likenesses must be considered. The examiner must make a judgment in each case by evaluating the totality of the documents.
Mark Songer is a Forensic Criminologist and Handwriting Expert. He provides investigations, reports, and testimony towards the resolution of matters involving disputed documents or signatures, including: wills, checks, contracts, deeds, account ledgers, medical records, and autograph authentication.