In any prosecution for perjury, it is an affirmative defense that the accused retracted the false statement in the course of the proceeding in which it was made, before the false statement substantially affected the proceeding and before it became manifest that its falsity was or would be exposed.
Del. Code tit. 11, § 1231
Retraction of false statement as affirmative defense
11 Del
Official source: Delaware Code Online. Reproduced from public-domain Delaware statutes; confirm against the official source for the current text. Not legal advice.