Marcus Stanley, who served as a senior economic adviser and at one time worked on the Senate Environment and Public Works Committee — chaired by Boxer — was stopped by a police officer Tuesday morning when he allegedly tried to “remove and conceal” a leafy green substance from his pocket during a security screening at the Constitution Avenue door of the Hart building around noon, according to a Capitol Police report.

Police confiscated the substance, which later tested positive for marijuana, and Stanley quickly resigned.