This. As a junior lawyer at a large law firm, one of my jobs was checking every cited case to confirm that it was cited correctly, that it actually supported t

This. As a junior lawyer at a large law firm, one of my jobs was checking every cited case to confirm that it was cited correctly, that it actually supported the theory that it was being used to support, and that it hadn't been overturned or qualified by subsequent case law. It's a process called Shepardizing that every law student does. So I can't fathom how fictitious cases could possibly be included in a brief. Also, just slightly mischaracterizing a case in a brief could be cause for being sanctioned. So I don't see how this type of issue would not undoubtedly result in sanctions.