Has Forensic Handwriting Analysis been down on the "I will kill" note?

I was a listener from the start, but drifted off after no news was coming out and just binged Undisclosed and a couple episodes from the fireman. I've always been a believer in Adnan's innocence, with a twinge of "anything's possible, maybe he did it."

I'm also a big fan of Forensic Files, not that it makes me an expert at all but in general I've learned a lot, and as such I am so thoroughly disappointed in the lack of evidence collected and analyzed in this case. To potentially have access to DNA and not test it is just unfathomable.

Apart from that I did a search for "handwriting analysis" thinking this had to of been done but couldn't find anything. Has this comparison been done to find out if he was the writer?