The legal standing or authority of a case may change over time. A citator, which is a citation index of legal sources is consulted to keep abreast of these changes. In the United States Shepard's Citations became a well know citation index. The verb Shepardizing is derived from the act of using Shepard's Citations, the process of consulting Shepard's to see if a case has been overturned, reaffirmed, questioned, or cited by later cases.
Use a citator to:
Shepard’s Citations and Shepard’s Table of Authorities are available in Lexis/Nexis Academic. Shepardizing is an option that can be displayed in your search results or you can search Shepard’s Citations directly with a case citation.