 The Mid-Prairie School District says it believes there's no substantive basis to a state board finding of probable cause that its superintendent and two former administrators violated conduct and ethics rules. The Iowa Board of Educational Examiners, which oversees state teaching licenses, issued its finding of probable cause against Superintendent Brian Stone in May. Even so, the next month, the board extended Stone's contract and gave him a raise. The board refused to say when it learned of the finding, calling it confidential.