Just so we are clear: "Sheriff Joe" and his cronies, never actually examined Obama's Birth Certificate. They looked at the PDF file.
Arpaio also employed, as one of his investigators, Jerome Corsi. Aside from being busted in multiple lies about the Birth Certificate issue over the years (see Corsi in Kenya), Corsi wrote a book a year ago:
Amazon.com: Where's the Birth Certificate?: The Case that Barack Obama is not Eligible to be President (9781936488292): Jerome Corsi: Books
Yes, I am sure this was really an unbiased and fair investigation.
This is all about the DOJ investigation into Arpiao. Now when they drop the hammer on him for his incompetence, he can claim it's political payback in order to muddy the waters and divert attention away from his own ineptness.