View attachment 30202
The blood is clearly too thick and combined with the rough wall surface and sliding motion, there is not likely to be any detail sufficient to match fingerprints. But what should be abundant here due to the rough surface and the sliding motion is the skin cells left behind by the artist.
In the December 18 visit they took both a rubbing and scrapings from this print. How could they not possibly have gotten a DNA result?
They spent as much time and attention on the collection of this sample as they did with the bra clasp. If they intended to bolster evidence against one of the suspects they may have changed their minds when they realized that Rudy Guede was claiming authorship for the writing on the wall. This would have looked really bad for the forensics team if the sample came up with a mixed profile that wasn't Rudy-Meredith.
Are the DNA results for sample W available or are they also lost in that garage?
ETA: Photo attached showing proper use of tweezers in collecting evidence. (ignore the fact that the swab was dropped to the floor, picked up and used to continue swabbing after this shot)
ETTA: Attached clip from previous photo with different label (what's up with that?) (And who is this inside the crime room on November 2nd not wearing a white bunny suit?!)