Maryland Public Safety Section 2-418
§ 2-418.
  (a)   (1)   Except as otherwise provided in paragraphs (2) and (3) of this subsection, a police employee who resigns from the Department for any reason may not be reappointed.
    (2)   A police employee who resigns to enter military service may be reappointed.
    (3)   By rule, the Secretary may reappoint a police employee who resigned in good standing if the individual meets the requirements then applicable for initial appointment.
    (4)   An individual may not be reappointed to a rank higher than the rank that the individual previously held as a police employee.
  (b)   An employee who is terminated from the Department may not be reappointed.