A KHN analysis of federal and state OSHA data found more than 780 covid-related complaints covering more than 2,000 public and private K-12 schools. But those pleas for help likely represent only a small portion of the problems, because a federal loophole prevents public school employees from lodging them in 24 states without their own OSHA agencies or federally approved programs for local and state employees. … KHN also found that practices contradicting safety experts’ advice are codified into the patchwork of covid rules put out by states and districts.