Iowa State University president Steven Leath won't be charged after allegations he used school airplanes for personal benefit. The Iowa Division of Criminal Investigation says Story County Attorney Jessica Reynolds declined to charge Leath earlier this month after determining "there was no probable cause to substantiate a violation of iowa law." The six-week investigation focused on whether Leath violated a law barring the use of state assets for any private purpose or personal gain. A DCI summary says agents interviewed several people and analyzed records after a Board of Regents audit in December found Leath used university planes for medical appointments in Minnesota, personal flight lessons, and trips to his North Carolina home. Leath has reimbursed the university for those flights. This week the Regents also took no action against Leath after an audit found he might have violated policy by storing and transporting guns without written approval.