Md. Code, Election Law § 12–306

(a) The treasurer of a contested election committee shall maintain detailed and accurate records of all:

(1) donations received by the contested election committee;

(2) disbursements made by the contested election committee; and

(3) outstanding obligations of the contested election committee.

(b) A contested election committee shall retain the records required to be maintained under subsection (a) of this section for a period of 2 years after filing a final report.