The Exclusionary Rule - What Is It and How Does It Work? Criminal Defense Attorney Marc J. Victor. In short, it is a law that prohibits the use of illegally obtained evidence in a criminal trial. Attorney Marc J. Victor goes into more detail about the Exclusionary Rule. Become a member of the Attorneys On Retainer Program and enjoy the relief provided by an existing attorney‑client relationship, drastically reduced attorney fees, and premium educational content.