EXCELSIOR SPRINGS – The Clay County Sheriff’s Office is investigating four reports that an Excelsior Springs School District staff member assaulted several Cornerstone Elementary School students. The sheriff’s investigation is separate from district and Missouri Childrens Division investigations. The district will determine whether the teacher violated district policies, the Childrens Division will determine whether the teacher treated children correctly and the sheriff will determine whether criminal acts took place. “The Excelsior Springs School District has cooperated fully with the investigation, and communication between the district and the Sheriff’s Office has been ongoing,” office spokeswoman Sarah Boyd said. The Excelsior Springs Police Department received a criminal complaint but then asked the sheriff to investigate because of a conflict of interest within the department. Police Chief Greg Dull said his inv...