So I've been voting the Sheriff a lot, and I still think he makes the most sense.  However, something has been lingering in the back of my mind for a while.  As Kira Tinsley lay dying, she uses her last moments to tell Jane her attacker had a tattoo with three dots on his left arm.  She uses her own blood to demonstrate the dots on her shoulder.

Here's what bugs me... she painted the dots vertically.  When McAllister, Reede and Bertram reveal their tattoos, they are in a horizontal line.  But according Kira, the three dots are in a vertical line.  

On that same note, did anyone notice that Haffner didn't reveal his whole shoulder to Jane?  He's the only one who doesn't.  The front half of his shoulder shows and the shirt covers the rest.  It could easily be covering three vertical dots.  I wonder if RJ might have a slight variation on the TIger, Tiger tattoo to demonstrate his higher authority.

Just a thought :)