In Higher Business Management graphology is mentioned briefly as a selection method in Human Resources. While the UK and USA experts do not think it is a valid, France (and Poland for that matter) take it a bit more seriously.
Here is an article from the BBC here.
Also remember to look at the differences in Richard Nixon’s signature (I have put it on the blog before). One that was taken when he was newly elected, and later when he was under severe stress of the Watergate scandal. There is an incredible difference.