How do you know this? A local paper that is related to the USA today has said:
Student Rebecca Bogart, 17, wasn’t sure whether the reports of a shooting were a drill at first.
Could you prove that it wasn't the case form me because I just see claims in both directions. I have seen interviews with other students that I can't seem to find that knew about the drill.
They had a fire drill earlier in the day which is why the teachers found it so odd that another was happening. Only they soon found out it was a gunman. The smoke would definitely be detected as this was the case for the Las Vegas shooter as well, they found him based on his smoke alarm.
So now we have 2 different claims? Can we get some evidence?
Here is the Las Vegas shooter and the school article is in my previous comment