Md. Code Ann., Corr. Servs. § 3-706

(a) In addition to any other deductions allowed under this subtitle, as an incentive to reduce a term of incarceration, an inmate may be allowed a deduction of 5 days from the inmate’s term of confinement for each calendar month during which the inmate manifests satisfactory progress in or completion of: (1) vocational courses; (2) other educational and training courses; (3) workforce development training; (4) cognitive–behavioral therapy; (5) substance abuse therapy; (6) life skills training; or (7) antiviolence therapy, including anger management and conflict resolution.

(b) The deduction described in subsection (a) of this section shall be calculated: (1) from the first day that the inmate participates in the course; and (2) on a prorated basis for any portion of the calendar month during which the inmate participates in the course.