California Code, Code of Civil Procedure - CCP § 1255.060

(a) The amount deposited or withdrawn pursuant to this chapter may not be given in evidence or referred to in the trial of the issue of compensation.

(b) In the trial of the issue of compensation, an appraisal report, written statement and summary of an appraisal, or other statement made in connection with a deposit or withdrawal pursuant to this chapter may not be considered to be an admission of any party.

(c) Upon objection of the party at whose request an appraisal report, written statement and summary of the appraisal, or other statement was made in connection with a deposit or withdrawal pursuant to this chapter, the person who made the report or statement and summary or other statement may not be called at the trial on the issue of compensation by any other party to give an opinion as to compensation.If the person who prepared the report, statement and summary, or other statement is called at trial to give an opinion as to compensation, the report, statement and summary, or other statement may be used for impeachment of the witness.