Unfortunately, I don't think that there is any such generic law.
There is a recent trend to use "graphology" as part of the
hiring decision. Graphology is a pseudoscience whose practioners
claim to be able to determine personality traits of the writer
of a handwriting sample, based not on the words but on how the
letters are formed. We also use lie detectors, even though
studies have shown them to be completely unreliable.