These ideas are probably too far-fetched to work, but then again, these are strange times.
To address the "false fire alarm" issue of a shooter using it to bring students out of hiding, how about a secondary alarm that screams "active shooter, active shooter"
What is the National Guard up to these days? Maybe every school could have a contingent of National Guardsmen/women guarding every entry point, and a few snipers on the roof.
Classrooms could install reinforced inner doors (sort of like a cockpit door) to slow down a determined gunman.
And, if the door won't stop the shooter, how about a high-powered semi-automatic weapon installed in each classroom, encased in glass with a sign that says: "In case of active shooter, break glass."
BBM
On the Reddit AMA with a surviver, there were people who don't think NC pulled the fire alarm. ( I agree with them. Why would NC alert first responders before he starts shooting?) A shooting spree can set them off.
Snipped from the ama:
sidTHAkid • 2d
Hey guys, /u/Shaine_Memes private messaged me a question that I thought should be answered to the public.
Did the fire alarm really go off? The news has said that the fire alarm went off right before this happened but from what I’ve seen you say, there’s no mention of it.
Yes, the fire alarm did go off. Despite beliefs, the fire alarm went off about 10-15 seconds AFTER he started shooting, I remember clearly. People across the school couldn't tell however, so they were treating it like a regular fire drill until word got around within a minute and everyone rushed back into their classrooms.
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atoMsnaKe • 2d
Wow.. What do you think, did the shooter activate the alarm?
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empireit • 2d
Just a shot in the dark here, but 10-15 seconds of gun fire would set off a fire alarm.
Edit: since this blew up, it’s been confirmed by u/getithowulivit that smoke generated by the weapon (and probably dust kicked up) set off the alarm.
Furthermore, u/TipCleMurican pointed out that fire detectors are triggered by two factors: heat and particulate matter in the air. These can be mutually exclusive, as pointed out by other users with examples like drywall dust and cat hair triggering false alarms. There is a ton of particulate matter in the air in the third room shot into. This is proven in (NSFW) THIS HORRIFYING VIDEO
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i****inghateratheism • 2d
Same thing happened in the Vegas shootings."
https://www.reddit.com/r/IAmA/comments/7xzpac/im_sid_fischer_a_student_who_was_in_the_third/