CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Opinion & Scientific Evidence
......Expert Testimony: In General
.........Lack of Foundation
8 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.

The opinion of an expert is no better than the reasons upon which it is based.

Summary judgment properly granted where medical expert's opinion was rendered without a reasoned explanation as to why the underlying facts led to the conclusion that hospital's nurses and doctors were negligent.

Medical doctor's declaration properly excluded for lack of foundation where it baldly stated his expert opinion was "based on his experience and documented medical literature."

Expert's opinion on defendants' sales costs properly excluded where it lacked foundation; summary judgment properly granted.

Expert testimony that traffic accident victim was driving while marijuana impaired properly excluded where evidence was speculative.

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.