Maryland Code, Criminal Law § 11-306

(c)(1) Subject to paragraph (2) of this subsection, in a prosecution under this section, it is an affirmative defense of duress if the defendant committed the act as a result of being a victim of an act of another in violation of Title 3, Subtitle 11 of this article or the prohibition against human trafficking under federal law.

(2) A defendant may not assert the affirmative defense provided in paragraph (1) of this subsection unless the defendant notifies the State's Attorney of the defendant's intention to assert the defense at least 10 days prior to trial.