When a witness testifies as a percipient witness rather than an expert, can you disregard any opinion that you find unbelievable, unreasonable or unsupported?

Can a witness testify as an expert in the form of an opinion? (California, United States of America)

In a personal injury action, does plaintiff have to disclose in his witness exchange list or, in response to a request at a deposition, the substance of the facts and opinions to which the witness will testify at trial? (California, United States of America)

Is a witness's opinion or opinion intertwined with the witness statements? (California, United States of America)

What is the effect of testifying in a criminal case if the witness is afraid to testify or fears retaliation for testifying? (California, United States of America)

When will an expert witness not reveal the content of a report prepared or opinion expressed by a nontestifying expert? (California, United States of America)

Can an expert witness whose opinion is based on inadmissible material describe the material that forms the basis of the opinion? (California, United States of America)

Can a witness be admitted as a witness at a preliminary hearing where the witness is in a state hospital? (California, United States of America)

Does section 2034(i)(2)(B) of the California Medical Code require an expert witness fee to be paid to a treating physician who also gives standard care opinion testimony? (California, United States of America)

When will a defendant's claim that references by prosecution witnesses to their fears of testifying to the jury have been deemed unreasonable? (California, United States of America)

Can a percipient witness offer opinion testimony? (California, United States of America)