In the real world - Crime scene sign-in sheets are standard procedure.
I still don't buy that the blinking signage was part of this. Not when all the info is looked at as a whole. One article I found referenced this school not being an active school but a site regularly used to stage drills of various circumstances. They incorporate whole small towns in staging these things, these drills. Full bore Hollywood stuff to achieve a real look for the disaster mediation they are performing. Google it, you'll find photos of participants standing around 'on break' with their fake limbs destroyed by bombs, hanging by threads, bloody as all hell... really realistic looking.. all for drill sake. Too much of this doesn't pass muster IMO.