Writing can be seen as a unique feature in each person's life, reflecting the individual story of each person. There are three characteristics associated with writing that make it unique in each human being, its personal, unique and identifying character. These particularities derive from the neuronal, muscular and psychic activity of each individual, making it in this way almost like a fingerprint. In this way, just as no two people are the same, there are not two exactly identical signatures, and it can even be said that if that happens it is because one of them is certainly false.

       In fact, the falsification of signatures has been a hotly debated issue today due to all the implications that this type of crime can bring and is associated with the most diverse purposes.
From falsification of signature in termination of employment contracts, in obtaining illegal academic degrees, issuing false checks or even in leases. The list of hypotheses are quite diversified, which means that the number of counterfeiters is too. As such, given the complexity of the issue at hand, it is extremely important to be aware of situations that may be more prone to this type of occurrence.

        However, when this happens, the indicated thing is to resort to a calligraphic skill, because unfortunately for the counterfeiters, nowadays there are several ways for experts to discover if a certain signature is really false.

Technically speaking, there are two major types of counterfeits, the slow and the fast. Ironically the slow one is fast and vice versa, because the slow one takes longer to reproduce, however, it is imitated at the same moment, while the fast one reproduces more Celtic but requires a continuous training to be plagiarized. Due to the slow to involve almost no contact with the original signature, it is difficult to find details of the counterfeiter, as opposed to the fast forgery that will incorporate those same details. The slow one is the one that is more easily detectable.

          In the verification of the authenticity of a signature it is necessary to take into account various aspects that allow to assure if the signature is doubted (authentic) or undoubted (questioned), that is, the spatial order, the dimension, the form, the pressure is observed , the speed, the direction, the inclination and the continuity of the stroke. This analysis, which considers writing as something alive and not static, is part of the graphophone method, the most important and currently used.

          In short, although prevention is better than cure if a type of falsification is suspected, it is more appropriate to resort to this type of investigation in order to correct the damage caused.