From The Kansas City Star: The Kansas City (Mo.) School District has problems with mold and air contaminants and has spent hundreds of thousands of dollars a year testing and cleaning some of its buildings. But that’s not what frustrates teachers the most. It’s how sparingly the district shares what it knows. Months went by before teachers at Trailwoods Elementary School learned why their school was cleaned over the summer. And teachers at Knotts Elementary still don’t know the degree of air contamination that had them scrambling out of their school a week before classes started.