S17, E13: Judith Barlow (Guest Star Charlotte Ross), a controversial speaker participates in a Question and Answer at Grammercy college when the stage is mobbed. Someone in the crowd fires a gun, leaving one student dead. Detective Ed Green (Jesse L. Martin) and Nina Cassady (Milena Govich) question the victims friend Malcolm Yates (Guest star Louis Cancelmi), an older PhD student who creates human embryos to harvest stem cells. It is discovered that Yates has Parkinson's disease and finds Barlow's tactics as a direct threat to his job and life. Yates' attorney, Bernie Adler (Guest star Ron Silver), is from the ACLU, during the trial Silver infuriates the jury by calling everyone racial epithets, which angers the judge. S. Epatha Merkerson, Sam Waterson and Fred Dalton Thompson also star.