You’ve likely seen people called graphologist in movies about criminals. The jobs of these folks is to study handwriting in either surmise the state of the writer in the time of writing or get in inside into the personality of the writer. In terms of handling crime, this method is specifically called Grapho-Forensic.

Grapho - Forensic focuses on the analysis of someone's repetitive behavior that can be seen from the writing and signature. A handwriting with regularities throughout the writing shows a normal behavior of a person. In contrast irregularities both in handwriting and signature can determine the authenticity, honesty, or even criminal tendencies.

Grapho - Forensic normally used by the authorities, but it can also be applied for your business or company necessity, such as checking authenticity of a signature, honesty of an employee, etc.