I was watching "Redemption Pt. 1" last night and I was struck by the scene where Picard visits Lursa and B'etor. They offer him tea. He drinks and leaves his cup behind. Would that be a possible event that provided the Romulans with Picard's DNA to create Shinzon? Obviously, there's been no on screen explanation how they came in possession of the DNA. I know that in "Unification" he was being held by the Romulans, so that would be another possibility. Do any of TNG novels touch on the DNA issue?