CONFIRMED: On the exact same day of the shooting, Parkland had a fully realistic crisis actor shooting drill
I don't know why MSNBC did this report, but they basically blew it. Now we are supposed to believe they had a fully staged crisis actor shooting drill (fake blood and makeup and all), and an actual shooting, at the same school on the same day, when that school has had 13 other similar crisis actor drills before.
Down this page a ways there is a video of a classmate filming hogg, saying he does not know why hogg is even in the school because he's too old, and only there to be a crisis actor. If this school had already staged 13 fake shootings with crisis actors before this so-called real one, it would strongly indicate the video where the student filmed Hogg really was taken before the phony shooting, as advertised.
At any rate, here is the NBC news video, which clearly states the school was loaded with crisis actors: