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FDS is making increasing use of digitising pads and specially designed software to capture specimens of handwriting and/or signatures of persons of interest in questioned document cases. This allows quantitative measurements of the dynamics of writing including speed, pressure, precise timings, sequence and direction of strokes.
The recorded information also includes the motion of the pen above the paper between writing strokes (such as within letters, between separate letters, between words or between separate components of signatures). This adds a wealth of information concerning the act of writing.
It can simplify the examination procedure by providing immediate determinations of writing structures in requested specimen writings and signatures that can take a long time or sometimes be impossible (for complex overlapping strokes) to determine by traditional microscopic observation.