When exhibits are mere photocopies - "...when a party failed to interpose a timely objection to evidence at the time they were offered in evidence, such objection shall be considered as waived."

LITO CORPUZ, Petitioner, vs. PEOPLE OF THE PHILIPPINES, Respondent. EN BANC. G.R. No. 180016, April 29, 2014.

“According to petitioner, the CA erred in affirming the ruling of the trial court, admitting in evidence a receipt dated May 2, 1991 marked as Exhibit "A" and its submarkings, although the same was merely a photocopy, thus, violating the best evidence rule. However, the records show that petitioner never objected to the admissibility of the said evidence at the time it was identified, marked and testified upon in court by private complainant. The CA also correctly pointed out that petitioner also failed to raise an objection in his Comment to the prosecution's formal offer of evidence and even admitted having signed the said receipt. The established doctrine is that when a party failed to interpose a timely objection to evidence at the time they were offered in evidence, such objection shall be considered as waived.”