Md. Code, Correctional Services § 3–708

Except as provided in § 3–706.1 of this subtitle, and notwithstanding any other provision of this subtitle, an incarcerated individual may not be allowed a deduction under this subtitle of more than:

(1) 20 days for a calendar month for an incarcerated individual described in § 3–707(a)(2) of this subtitle; and

(2) 30 days for a calendar month for all other incarcerated individuals.