There are two main case law citators to verify the status of your case - on LexisNexis, it is Shepards and on Westlaw it is Keycite. Keyciting and Shepardizing are also a method for finding other cases and secondary sources relevant to your topic.
There are differences between the citator symbols used by Westlaw and Lexis, but as a general rule, in either Westlaw or Lexis cases with a red flag or red stop sign may no longer be good law and should not be relied upon without doing further research. Similarly, cases with a yellow flag or yellow triangle should be used with caution because they may have been distinguished by other court rulings. Remember, that you need to take into account the jurisdiction of your case and the cases citing your case in order to determine if your case is still good law.
Lexis Shepards Symbols:
Westlaw Keycite Symbols:
BCite is a citation analysis tool similar to KeyCite and Shepards, which gives you links to all cases citing your case.
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