Md. Code, Criminal Procedure § 6–211

(a) Subject to subsection (b) of this section, the Commission shall adopt as regulations sentencing guidelines and any changes to those sentencing guidelines, subject to Title 10, Subtitle 1 of the State Government Article.

(b) Regulations adopted under subsection (a) of this section are voluntary sentencing guidelines that a court need not follow.

(c) A change to the sentencing guidelines takes effect on the day that the regulation takes effect as provided under Title 10, Subtitle 1 of the State Government Article.