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Every case is different and there is no fixed or ideal number of specimen documents that are required. As a general comment, the more specimen material we have the better the basis for a strong result.
The nature of the specimen documents required will also differ from case to case so please contact us to discuss the specifics of your matter so we can advise you of what is required for the examination.
Regarding signature examinations, in the order of 10 to 20 specimens is usually a good starting point but we often proceed with fewer examples depending on the inherent complexity of the signatures. Our examiners need to be able to reasonably assess natural variation in the signatures written by the person of interest. Therefore, it is better to have too many than too few. If among only three specimen signatures provided our examiners can reasonably account for the features occuring in the questioned signature, having only three specimen signatures is not a limitation. However, if differences are observed between a questioned signature and only three specimens, it can be difficult to assess the significance of the differences and further specimens will be needed.
For both signatures and handwriting, having specimens dated as close as possible to the date of the questioned document is very important as signatures and handwriting can evolve over time.