Okla. Stat. tit. 15, § 15-11: Persons authorized to contract

All persons are capable of contracting, except minors, persons

of unsound mind, and persons deprived of civil rights, however,

persons sentenced to imprisonment under the Department of

Corrections for any term, during confinement under said sentence,

may make employment contracts, subject to the approval of the

Director of the Department of Corrections, when this benefits the

vocational training or release preparation of the prisoner; provided

however, such persons during confinement shall not be eligible to

receive benefits under the unemployment compensation law.