In any hearing or trial, an affidavit signed by a government official who is competent to testify, deemed to have custody of an official record, or signed by his designee, stating that after a diligent search, no record or entry of such record is found to exist among the records in his custody, is admissible as evidence that his office has no such record or entry, provided that, if the hearing or trial is a proceeding other than a preliminary hearing, the procedures set forth in subsection G of § 18.2-472.1 for admission of an affidavit have been satisfied, mutatis mutandis, and the accused has not objected to the admission of the affidavit pursuant to the procedures set forth in subsection H of § 18.2-472.1, mutatis mutandis. Nothing in this section shall be construed to affect the admissibility of affidavits in civil cases under § 8.01-390.