Okla. Stat. tit. 57, § 57-350: Deduction from sentence of time spent on parole -

Revocation of parole.

A. Every person, hereinafter referred to as "convict", who has

been or who in the future may be sentenced to imprisonment in any

state penal institution shall, in addition to any other deductions

provided for by law, be entitled to a deduction from his sentence

for all time during which he has been or may be on parole. The

provisions of this section are hereby declared to be both

retroactive and prospective, and to apply to convicts who are on

parole on the effective date of this act as well as to convicts who

may be paroled thereafter; and shall at the discretion of the

paroling authority apply to time on a parole which has been or shall

be revoked.

B. Beginning November 1, 1987, the paroling authority also

shall have the discretion to revoke all or any portion of the

parole.