Requirement to issue reasoned decision
Iran, Islamic Republic of
Article82- After examining thecomplaints and reports, if the Board of Executive decides that the course ofthe election in one or several polling stations has diverged from the normalcourse and has not taken place correctly, it will declare the results of one orseveral polling stations invalid with the confirmation of the Guardian Council.
Source: Iran law on presidential election (approvedby the 6th Parliament and amended on 2013).
http://www.sssup.it/UploadDocs/4748_5_O_Iran_Electoral_Law_on_Presidential_Elections_10.pdf
Source for the comment:
http://www.princeton.edu/irandataportal/elections/pres/law/Executive_Bylaw.pdf