A&E produced a Investigative Reports program on the case where they hired an independent handwritting analysis who conclusively ruled Patsy Ramsey out as the writter of the note.
Once again, handwritting analysis is not an exact science and it up to interputation of the examiner.
It may not be an exact science but when a majority seems to be pointing in one direction you have to listen to it, am I right?
Here's a Statement Analysis of the Ransom Note:
http://www.statementanalysis.com/ramseynote/