Where can I find the details of my school's protocol for lockdown procedures, exits and egresses, and safety in an emergency?

All schools are trained every September on General Response Protocols (GRP). In addition, consult with your chapter leader about the school's safety plan.

You can find more information about those protocols and school safety plans in the UFT's School Safety Manual: https://www.uft.org/sites/default/files/attachments/school-safety-info-manual.pdf.