Okla. Stat. tit. 43A, § 43A-5-504

A. Upon the filing of a petition alleging that a minor is a

minor in need of treatment and requires inpatient mental health or

substance abuse treatment, or upon the assumption of custody of an

alleged deprived child pursuant to the provisions of Section 1-4-201

of Title 10A of the Oklahoma Statutes, or when a minor is the ward

of the court, the judge of the district court having juvenile docket

responsibility shall have jurisdiction of any minor who is or is

alleged to be a minor in need of treatment and of the parent or

legal custodian of the minor, regardless of where the parent or

legal custodian is found. When jurisdiction has been obtained over

a minor who is or is alleged to be in need of treatment, such

jurisdiction may be retained until the minor is discharged from

treatment ordered by the court. For the convenience of the parties

and in the interest of justice, a proceeding under the Inpatient

Mental Health and Substance Abuse Treatment of Minors Act may be

transferred to the district court in any other county.

Oklahoma Statutes - Title 43A. Mental Health Page 167

1. The venue for legal proceedings pursuant to the Inpatient

Mental Health and Substance Abuse Treatment of Minors Act shall be:

a. the county where the minor resides,

b. when the minor is in the custody of a public or

private child care agency, the county in which the

minor resides at the time legal proceedings are

initiated, or

c. the county of original jurisdiction.

2. The district court in which a petition is filed or the

district court in which custody has been assumed pursuant to the

provisions of Section 1-4-201 of Title 10A of the Oklahoma Statutes

may retain jurisdiction of a minor in need of treatment in such

proceeding even if the minor is subject to the jurisdiction of

another district court within the state. Any orders made by the

court in which the petition is filed shall control over prior orders

in regard to the minor.

3. The district court in which a petition is filed which

alleges that a minor is a minor in need of treatment may issue any

temporary order or grant any interlocutory relief authorized by the

Inpatient Mental Health and Substance Abuse Treatment of Minors Act

even if another district court within the state has jurisdiction of

the minor or has jurisdiction to determine the custody or support of

the minor.

4. If the district court in which a petition is filed pursuant

to either paragraph 2 or 3 of this subsection sustains the petition,

the district court shall have the jurisdiction to make a final

determination on the petition or to transfer the proceedings to a

court having prior jurisdiction over the minor. Where the other

proceeding is pending in the same judicial district in which the

petition is filed, the chief judge of the judicial district shall

determine which judge shall try the issues when the judges to whom

the cases have been assigned are unable to agree on the procedure

that should be followed.

B. Unless otherwise specifically provided by the Inpatient

Mental Health and Substance Abuse Treatment of Minors Act and Title

43A of the Oklahoma Statutes, the rules of civil procedure shall

apply to all legal proceedings pursuant to the Inpatient Mental

Health and Substance Abuse Treatment of Minors Act.