the lack of press coverage of the facts of the case, correcting earlier misreporting, has been astounding
The list of unknowns is at least as long as the list of knowns. That's a bad sign, and the longer that disparity remains, the worse it looks. Where are the facts? Who's been hiding them? Why? On whose authority?
The Newtown massacre is an ongoing investigation. The toxicology report probably hasn't even been concluded. Because of pending lawsuits, I doubt you will see a comprehensive report released anytime soon.
Investigators have to check out every rumor and allegation.