“you are just going to give it a pass.”
You asked me if I knew where they got the footage from, and I answered your question. I don’t see how that qualifies as “giving it a pass”. From what you post, it sounds like it is most likely stock footage that CNN has been sprinkling into their news reports to make them more exciting. They really should note it as stock footage if that is what it is.
St. Lima’s VERY LIKELY does not have an array of incidents that lead to stock footage of people swarming it in tactical gear.
The most likely scenario is that it is either from some kind of drill, that it is from an incident two days later, or it was taken the day of the massacre if St Lima’s had a team go in to protect the school.
Whatever the case, it is interesting that it has taken a month for it to come out that CNN used fake info on Sandy Hook.