In a case where a previous conviction is charged under the provisions of sub-section (7) of section 234, and the accused does not admit that he has been previously convicted as alleged in the charge, the Judge may, after he has convicted the said accused under section 252 or section 258, take evidence in respect of the alleged previous conviction, and shall record a finding thereon:
Provided that no such charge shall be read out by the Judge nor shall the accused be asked to plead thereto nor shall the previous conviction be referred to by the prosecution or in any evidence adduced by it, unless and until the accused has been convicted under section 252 or section 258.
Legal Commentary & Landmark Judgments: Section 259
Section 259 of the Bharatiya Nagarik Suraksha Sanhita, 2023 prescribes the procedure regarding previous convictions for the purpose of enhanced punishment in Sessions trials.
Section 259 shields the accused from prejudice. A prosecutor who mentions prior convictions during the trial on the merits commits a grave procedural violation, entitling the defense to object and seek trial vitiation.