There was a 100 million dollar lawsuit request made at Sandy Hook and then withdrawn.
I suspect they are going to have to withstand some lawsuits or settle.
It appears there were issues about locks on some classroom doors and keys.
One of the teachers is a stepdaughter of a reporter for a local paper. Lauren Rousseau
Reports are that as a substitute She didn’t have the key to lock her door.
Had she had the key, she might be alive as well as the children.
“”We became aware that not all substitutes had keys,” Superintendent of Schools Janet Robinson said Wednesday.”
The father of the teacher said she did not have a key
http://www.cbc.ca/news/canada/montreal/story/2012/12/18/quebec-lauren-rousseau-conn.html
If true, He has grounds for a lawsuit and I think they will settle.
What good would keys do?
I don't know the details at the school, but I think large glass windows in doors are pretty standard in schools, as well as windows in classroom walls in some. Principals like to walk the halls and see what is going on in the rooms. (These days it is also due to fears that teachers might more easily molest kids if they can't be seen from the hall.)
With a glass windowed door, all the perp has to do is break the window, turn the inside knob, and walk in.
I don't think keyed deadbolts in a classroom would go over well with the fire marshall.
Maybe an emergency device that could be secured would be feasible (similar to the old 2x4 in brackets setup but harder to defeat. Also, school doors must open outward). Again, there are very strict fire laws about school doors due to some horrible tragedies years ago.