Md. Code, Crim. Law § 12-110

Current with effective changes from the 2020 Legislative Session through Ch. 645
Section 12-110 - Recovery of gambling loss
(a) A person who loses money at a gaming device that is prohibited by this subtitle, Subtitle 2 of this title, or Title 13 of this article:
(1) may recover the money as if it were a common debt; and
(2) is a competent witness to prove the loss.
(b) Notwithstanding subsection (a) of this section, a person may not recover money or any other thing that the person won by betting at a gaming device prohibited by this subtitle, Subtitle 2 of this title, or Title 13 of this article.

Md. Code, CR § 12-110