Okla. Stat. tit. 57, § 57-65: Credit for good behavior and blood donations - Duty of

sheriff.

Any person in this state convicted of a crime, who is serving

time as a prisoner in the county jail of any county in the State of

Oklahoma as a result of said conviction of crime, shall be entitled

to receive five (5) days' credit for every four (4) days' time in

said county jail provided said prisoner shall have obeyed the rules

and regulations promulgated by the sheriff in charge of said county

jail in a satisfactory manner. Each prisoner shall also, in

addition thereto, be entitled to a deduction of three (3) days for

each pint of his blood he donates during his first thirty (30) days

of confinement in the county jail, and to five (5) days for each

pint of his blood he donates during any sixty-day period thereafter

to the American Red Cross or to a hospital approved for such purpose

by the sheriff. And the sheriff of said county is hereby authorized

to order said credit to be given to said prisoner on the records of

the court out of which said conviction is had.