Except as otherwise provided by law, evidence of the following shall not, in any judicial or administrative proceeding, be admissible against the criminal defendant who made the plea or was a participant in the plea discussions:
provided, however, that the statements described in paragraphs (1) through (4) of this Code section shall be admissible in any proceeding wherein another statement made in the course of the same plea or plea discussions has been introduced and the statement ought in fairness be considered contemporaneously with it or in a criminal proceeding for perjury or false statement if the statement was made by the accused under oath, on the record, and in the presence of counsel or after the accused voluntarily waived his or her right to counsel.
OCGA § 24-4-410