“For all of this school year and likely most of last year, students and staff on campus have been exposed, or at least have risked exposure, to chrysotile and amosite asbestos. After this unacceptable phase of exposure, the School District must act appropriately moving forward with a public, documented plan,” the teachers wrote. “Any secrecy, attempts to hurry reentry to the building, or pressure to silence employees on the part of the district will be understood as acts of endangerment."