Okla. Stat. tit. 30, § 30-3-305: Testimony of a witness located in another state

(a) In a guardianship or protective proceeding, in addition to

other procedures that may be available, testimony of a witness who

is located in another state may be offered by deposition or other

means allowable in this state for testimony taken in another state.

The court on its own motion may order that the testimony of a

witness be taken in another state and may prescribe the manner in

which and the terms upon which the testimony is to be taken.

(b) In a guardianship or protective proceeding, a court in this

state may permit a witness located in another state to be deposed or

to testify by telephone or audiovisual or other electronic means. A

court of this state shall cooperate with the court of the other

state in designating an appropriate location for the deposition or

testimony.

(c) Documentary evidence transmitted from another state to a

court of this state by technological means that do not produce an

original writing may not be excluded from evidence on an objection

based on the best evidence rule.