Maryland Code, Labor and Employment § 3-1204

(i) the denial is necessary to prevent substantial and grievous economic injury to the operations of the employer;

(ii) the employer notifies the employee of the intent of the employer to deny restoration of the employee's position of employment at the time the employer determines that economic injury would occur; and

(iii) in a case of parental leave that has already begun, the employee elects not to return to employment after receiving notice of the employer's intention to deny restoration of the employee's position of employment; and