Okla. Stat. tit. 43, § 43-601-604: Law, procedures and remedies to be applied

A. Except as otherwise provided in subsection D of this

section, the law of the issuing state or a foreign country governs:

1. The nature, extent, amount, and duration of current payments

under a registered support order;

2. The computation and payment of arrearages and accrual of

interest on the arrearages under the support order; and

3. The existence and satisfaction of other obligations under

the support order.

B. In a proceeding for arrears under a registered support

order, the statute of limitation of this state or of the issuing

state or foreign country, whichever is longer, applies.

C. A responding tribunal of this state shall apply the

procedures and remedies of this state to enforce current support and

collect arrears and interest due on a support order of another state

or foreign country registered in this state.

D. After a tribunal of this state or another state determines

which is the controlling order and issues an order consolidating

arrears, if any, a tribunal of this state shall prospectively apply

the law of the state or foreign country issuing the controlling

order, including its law on interest on arrears, on current and

future support, and on consolidated arrears.