Maryland Code, Labor and Employment § 3-1403

(a) An employer may not consider any period of time during which an eligible employee takes organ donation leave to be a break in the eligible employee's continuous service for the purpose of the eligible employee's right to salary adjustments, sick leave, vacation, paid time off, annual leave, or seniority.

(b) An eligible employee who returns to work after taking organ donation leave is entitled to be restored by an employer:

(c) An employer may deny restoration of the eligible employee's position of employment under subsection (b) of this section because of conditions unrelated to the exercise of rights established under this subtitle.