Direct Duke to strengthen its policies and procedures related to approving travel expense reports. Updated procedures could include: a. Updating its travel policies to include explicit guidance regarding whether Duke will reimburse travelers for per diem claimed on date(s) before a conference begins and/or after a conference ends. b. Implementing a control to validate the claimed per diem rates against those outlined on the Department of State website. c. Requiring travelers combining personal and business travel to submit documentation to support that combining the itineraries did not increase the cost of the trip.