CALIFORNIA FAMILY LAW
...Procedure Before Trial/Hearing
......Trials/Requests for Orders
.........Expert Opinions
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Experts' opinions.

Expert may state reason and basis for opinion.

Improper basis of opinion.

Expert may not rely on case-specific hearsay in forming opinion.

In public nuisance case, trial ct. erred in allowing expert witness to testify to case-specific hearsay to show gang created nuisance activity; error harmless as other competent evidence showed such activity.