No school board member may participate in discussing or vote on any issue in which he has a conflict of interest. Each school board member must decide if any potential conflict of interest requires him to be disqualified from participating in discussion or voting. However, no school board member may participate in discussing or vote on an issue if:
(1) the school board member has a direct pecuniary interest in the matter before the school board; or
(2) at least two-thirds of the school board votes that the member has an identifiable conflict of interest that should prohibit him from voting on a specific matter.