Complete an affidavit in California by writing down relevant statements about a particular legal issue, then signing the document in the presence of a notary public or officer of the court, states Free Affidavit Form. Include the name and personal information of the person presenting statements, the exact evidence or testimony he is presenting, and the signature of the official witness.
Courts accept affidavits in legal proceedings when personal testimony is required but the person is unavailable due to illness, death, incarceration, residence in another state or other valid reasons, explains Free Affidavit Form. Specific affidavit forms are available for a variety of legal scenarios, including guardianship, divorce, residency and ownership. Affidavits are written in first or third person, depending on who drafts the document, and they must contain a statement at the end that all information presented is true. Perjury charges may result from including any false statements in an affidavit.
Small claims courts often accept affidavits in place of a witness's testimony, according to Virtual Self-Help Law Center. The affidavit of a general witness in small claims court must contain the witness's name and address, the date of events witnessed, and a specific description of the events. The affidavit of an expert witness includes his expert credentials and any relevant opinions and conclusions related to the disputed issue.