No they have immunity in the form of a Insurance against law suits they are the ones who pay not the actual school board..Having served on a pension board we had the same policy most elected or appointed officials have such a policy...
I’m sure they have liability insurance, as do the teachers (if they are union members) in Broward County, but that is not the same as immunity. They may not have any financial exposure but being sued by the parents of deceased children would certainly end a political career, and be sobering to those seeking a school board seat.