Janusz Dziechciaruk
Problems of Forensic Sciences (Z Zagadnień Nauk Sądowych), 134, 2023, s. 133 - 141
https://doi.org/10.4467/12307483PFS.23.008.19057According to experts’ opinion which was also confirmed by many different experiments on handwriting, most errors made by document examiners result from a misjudgment (or misinterpretation) in the significance of a difference found between the questioned and exemplar materials. The article introduces a number of ideas for improving methodology for examination of handwriting, especially how to understand one of the main principles respecting writing identification that a writer cannot ameliorate his maximum writing ability or skill without effort, practice and/or training over a period of time, or how to prepare writing standards for examination of distorted writing.
Janusz Dziechciaruk
Problems of Forensic Sciences (Z Zagadnień Nauk Sądowych), 125, 2021, s. 19 - 27
https://doi.org/10.4467/12307483PFS.20.002.14782The fundamental principle of identification, based on the condition that there is a unique combination of independent discriminating elements in handwriting, is analysed. The results of experiments conducted on distorted handwriting suggest that there may only be one handwriting habit that is responsible for the individuality of handwriting. By analysing disguised and simulated signatures and applying the isochrony principle, it seems reasonable to conclude that the mutual interaction between the speed of writing and the curvature of a graphic line is the only habit, and the quality of a graphic line the only feature responsible for the individuality of handwriting. The article introduces a number of ideas for evaluating the quality of a graphic line during handwriting examination, and a number of new opportunities for research into biometric electronic signatures.