If a public body is in an open meeting and wants to close the meeting under any of the permissible exceptions to OMA, it must be approved by a majority vote of a quorum of the public body. The motion must state with reasonable specificity the subject to be discussed.
The vote on closure must occur in an open meeting and the vote of each member of the public body must be recorded in the minutes. Only those subjects announced or voted upon prior to closure by the public body may be discussed in a closed meeting. As a result, a matter not on the agenda for the meeting cannot be discussed in a closed session. NMSA 1978 § 10-15-1-I(1)