CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Opinion & Scientific Evidence
......Expert Testimony: In General
.........Things Expert May Not Rely On
............Unsupported Factual Assumptions
6 Cards On This Topic:

Trial court acted within its discretion in excluding opinion testimony that P company would have become extraordinarily successful had USC completed the clinical testing to which parties had contracted.

Supreme Ct. determined the trial ct. ruled correctly, thus foreclosing, as law of the case, further action in the trial ct. on lost profit damages.

Trial court did not err in excluding D's expert evidence that, if there were no shooting of mother, her fetus would have died anyway because of fatal medical condition.

An expert opinion must not be based upon speculative or conjectural data.

Expert opinions must have evidentiary support and may not be based solely on conjecture.

An expert's assumption of facts contrary to the proof destroys the opinion.