As the K-9 unit arrives and more of your troops get there, you start an outer perimeter search. You are looking for something suspicious. The problem is, what's suspicious? You don't work there every day so how will you know? Will you have a groundskeeper or maintenance person searching with you? It's just like searching inside the school; only the teachers really know what is in their rooms. Your K-9 is only trained to identify certain explosive compounds, so even after a clean sweep you can't say with any authority it's safe to go back in.
Some of the tactics we use are archaic; we do them to say we did. If there were to be a real bomb hidden somewhere in the school, the chances of our finding it are slim. We could walk right by one and never know it. The people who are best at knowing what should and shouldn't be there seldom search with you or check on their way out of the building. This is our real purpose for evacuating. We may not find the bomb but we can hopefully stop people from getting hurt by getting them out of the blast zone.
Once the inner and outer search is done and your staging areas are set (EMS, parent pick-up, etc.), the only thing left to do is wait. Some agencies wait half an hour past the deadline and some wait longer. Once the agreed upon amount of time passes you turn to the principal and give her the standard speech. You tell her that you have done the best you can do and still can't guarantee that there isn't a bomb in the school. It's her call to decide when to let everyone go back inside. She thanks you sarcastically and gets the students ready for the buses, which was her main concern in the first place. You already convinced her to hold the buses 30 minutes past their scheduled departure time and she is not happy.
Post Response
Think It Through Questions
Did I interview and get a statement from the receptionist?
Did I collect all possible evidence?
Did I conduct a good debrief with everyone to see how we can do it better next time?
Is there any way we can improve our response by suggesting policy changes?
The rest of the call is handled like any other crime. You take a statement from the person who received the call. The officer assigned the report documents all the steps and measures that were taken. You clearly state in the report what was said to the principal. If the principal gave you any grief, make sure that's documented as well. You need to identify a list of students who are possible troublemakers. You need to identify a list of possible disgruntled parents. You also need to check for any employees who have been recently fired. You hold a quick debrief including members of the school's administration and identify the good, bad, and ugly. You plan on taking a look at policy and see where it can be changed.