CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Opinion & Scientific Evidence
......Expert Testimony: In General
.........Lack of Foundation
3 Cards On This Topic:

E may not use his chart/exhibit regarding "gang member depression," for which no foundation laid, but may be questioned as to his observations and studies of gang member depression.

Cannabis expert's testimony on D's lawful cultivation of marijuana defense properly excluded as E lacked sufficient evidence to render the opinions under EC 801(b).

Trial court properly excluded Ps' expert asbestos witness' declaration where it lacked proper foundation and amounted to speculation.