Honestly, there's no such thing as a "smoking gun" unless whomever murdered Caylee were so daft as to make a videotape of them doing it and then attached a yearbook photo of them.
Yes, this whole "OMG Bombshell!" stuff is an issue, but, IMO, a different one. NG has ratings to get, and personally I think everyone should just toss their TV out the window, but we have to piece together what we have and not what people wish we had.
That said, the absence of some things (ie, fingerprints on the syringe and gatorade bottle), especially considering we know chloroform does dissipate and we don't know (AFAIK) how loose the bottle lid and syringe packaging was, it seems impossible to say either "this is a smoking gun" or "this is totally unrelated". YKWIM? I'm not gonna argue semantics with Nancy Grace as I don't watch her and her voice makes me want to run up the walls, but on the other end, we can't deny that (IMO, AFAIK, YMMV) there appears to be chloroform traces on the syringe, which somehow ended up next to a dead body that also seems to have been contained in a car trunk that also had detectable amounts of chloroform.
So.. I guess as a person who doesn't watch TV and pretty much relies on document dumps and WS to keep me straight vis a vie this stuff.. I am grateful for people who can make heads or tales of the data graphs, and I would encourage those who take more umbrage with the machinations of Nancy Grace to take it to a thread specific to her.