I used to have these problems in my school.
We had 8 bomb threats in a span 0f 10 school days, not one of them fased the admin enough to even announce it. The only reason we know is because the SI released a letter to all parents telling them of the problems we face in a school society or some crap.
Your school really is retarded though, they got everyone worried over nothing. Not once in all my 3 years of being at my school have we ever been in a huge panic or had parents take kids out of school after a bomb threat. You know why? They don't tell us what is happening. We get told that we are having an evac' drill and move out the school, it's only the teachers that later tell us that we could have all been blown up.
The only time I ever saw a panic at my school is when everyone was sat on the football stands and thought a huge floodlight was falling on the stands. It was just the way the sky was moving, needless to say I am not proud of attending Poinciana High School.
I think its nice that your school district worries enough to actually do something though, we
did have SWAT clear the school last school year because of a kid supposedly having a gun, but once again we didn't find out until afterwards. (Teachers have to put green card in the door window to signal the class is fine, hense us not being able to see out)
Once again, it's nice that your school over reacts, because mine barely even reacts when something like that happens. I would rather have to be searched everyday than later find out we were sat on a bomb.