Heres wat we know so far with this chart

And according to CodeMonkeyz ---
UV light is able to detect fingerprints. I talked with Bobby Piton and we discussed whether the audit team may be looking for fingerprints or not. It was our conclusion that a lack of fingerprints may mean the ballot might have been marked using non-human means.
In such situations, extra scrutiny of the ballot may be wise.

water marks are on only official ballots