My son was home recently and allowed me to stroll through his access port to WestLaw. This is a legal site one subscribes to. Access is limited to those who pay. As he is a law student, he is given this access. As I am his father and paying for his education, I, too, get some access when he is here. Thus I asked him to download this as I am always looking for new windows to view CUE through. It is one of the more complicated venues to revise a prior decision but is a minefield of codicils on what is or isn’t permitted. There are numerous “Yes, but not if….” regulations that confuse Vets.
I add this here for those of you who are legally inclined. It is a wonderful compendium of legal opinions from SCOTUS down to the CAVC- all precedental of course. Some of the links may be defective but can easily by found by googling them. What is important is in knowing which precedental case controls which facet of the suspected CUE. Obviously, duty to assist (or the failure to) will be found in Cook v. Principi (US). Oddly, there are narrow grounds to win there in spite of what Caffrey holds.

Can any citizen allege a CUE in a case in which they have no personal connection if they have new evidence which would probably result in a different decision favorable to the veteran?
A Veteran’s designated representative can file CUE. You cannot add new evidence in a CUE claim. You are revising an old one with what was there then. CUE is a very specific kind of error. I have posted quite a bit on it. Check the search bar.