Connecticut State's Attorney Stephen J. Sedensky III released some documents and issued a statement regarding the mass shooting at Sandy Hook Elementary School last December. It is important to read the statement and not rely solely on the documents because further investigation has proven that some of the stated facts in the warrants issued immediately after the shooting were incorrect. Unfortunately some of that incorrect information is being repeated in news stories today.
For example, here are a couple of corrected items:
Subsequent investigation revealed that shootings took place in two of the classrooms, not three, and that the shooter was not wearing a bullet-proof vest...
The claim that the shooter was wearing a bullet-proof vest has been used by some gun control advocates as evidence that an armed guard, police officer, or other adult with a permit to carry would probably not have been effective in stopping the shooter. There may be other arguments along those lines, but we can rule out a bullet-proof vest in this case. There is a similar issue with the Aurora, CO shooter, but I have not seen anything definitive and with the case still active it may be awhile still on that score.
As far as new information, reports are focusing on the number 30-round magazines and bullets fired, but there may be something more telling in this:
Recovered from the person of the shooter, in addition to more ammunition for the handguns, were three, 30-round magazines for the Bushmaster, each containing 30 rounds. Located in the area of the shootings were six additional 30-round magazines containing 0, 0, 0, 10, 11, and 13 live rounds respectively. One-hundred-and-fifty-four spent .223 casings were recovered from the scene.
That's in addition to one more magazine in the rifle that contained 14 rounds and one round in the chamber.
The numbers don't add up if Lanza walked in with 10 30-round magazines, but any number of reasons could explain that. However that, combined with the partially filled magazines left "in the area" and not on his person, suggests that his rifle jammed at least several times.
That doesn't matter to the victims, of course, but it may be a real world data point in the discussion about the effectiveness of limiting magazine sizes. My experience back in the day with that type of ammunition and rifle was that 30-round magazines were far more likely to jam than the 10 or 20-round ones. We may still want to ban the 30-rounders, but one perverse consequence might be to make it less likely that a mass shooter's weapon would jam in an attack.
Regardless, we need to continue to get more details about what actually happened at Sandy Hook and that theater in Aurora so we can make informed policies, not ones based on speculation. While we should spare the families and guard legal cases as much as we can, if we can't get the info to learn real lessons from actual events we are not very likely to come up with effective policies to prevent or limit the next one.