The document discusses the importance of using Shepard's for legal research. It notes that once a relevant case is found, Shepardizing is necessary to verify that the case is still good law and has not been overturned or contradicted by more recent rulings. Additionally, Shepardizing allows researchers to find other cases that support the same legal principles and confirm citations are accurate. The document also provides an overview of the customization options available in Shepard's, such as restricting results by jurisdiction, headnotes, or date.