Okla. Stat. tit. 21, § 21-12.1: Required service of minimum percentage of sentence –

Effective date.

A person committing a felony offense listed in Section 30 of

this act on or after March 1, 2000, and convicted of the offense

shall serve not less than eighty-five percent (85%) of the sentence

of imprisonment imposed within the Department of Corrections. Such

person shall not be eligible for parole consideration prior to

serving eighty-five percent (85%) of the sentence imposed and such

person shall not be eligible for earned credits or any other type of

credits which have the effect of reducing the length of the sentence

to less than eighty-five percent (85%) of the sentence imposed.