Pursuant to chapter 1-26, the board may promulgate procedural rules for the effective enforcement of this chapter and for the exercise of the powers and duties conferred upon it. Additionally, the board shall utilize the following standards in determining if the inmate has substantively met the requirements for parole release at the initial parole date:
The board may also use standards in subdivisions (1) to (3), inclusive, of this section in discretionary parole decisions. In addition, in considering a discretionary parole for an inmate who previously violated parole, the board may consider the nature and seriousness of the conduct leading to the parole revocation.
SDCL 24-15A-42