Search Westlaw's Key Number system to find cases categorized under the following topics and key numbers. Remember to filter your results by jurisdiction.
157K555.2 > Basis of opinion > Necessity and sufficiency
157K555.10 > Basis of opinion > Medical testimony
157K557 > EXAMINATION OF EXPERTS > Experiments and results thereof
157K555.5 > Basis of opinion > Cause and effect
110K695.5 > PROCEDURES FOR EXCLUDING EVIDENCE > Hearing, ruling, and objections
110K486(2) > Basis of opinion > Necessity and sufficiency
110K486(1) > Basis of opinion > In general
FEDERAL COURTS
170BK3600 > Procedural matters > Expert evidence and witnesses