Okla. Stat. tit. 12, § 12-2104: Rulings on evidence

A. Error may not be predicated upon a ruling which admits or

excludes evidence unless a substantial right of a party is affected,

and:

1. If the ruling is one admitting evidence, a timely objection

or motion to strike appears of record, stating the specific ground

of objection, if the specific ground was not apparent from the

context; or

2. If the ruling is one excluding evidence, the substance of

the evidence was made known to the judge by offer or was apparent

from the context within which questions were asked.

B. The court may add any statement which shows the character of

the evidence, the form in which it was offered, the objection made

and the ruling thereon. It may direct the making of an offer in

question and answer form.

C. In jury cases, proceedings shall be conducted, to the extent

practicable, so as to prevent inadmissible evidence from being

presented to the jury by any means, including making statements or

offers of proof or asking questions within the hearing of the jury.

D. Nothing in this section precludes taking notice of plain

errors affecting substantial rights although they were not brought

to the attention of the court.