Cal. Welfare and Institutions Code § 1741

The judge before whom the person was tried and committed, the district attorney or other official who conducted the prosecution, and the probation officer of the county, shall obtain and with the order of commitment furnish to the authority, in writing, all information that can be given in regard to the career, habits, degree of education, age, nationality, parentage and previous occupations of such person, together with a statement to the best of their knowledge as to whether such person was industrious, and of good character, the nature of his associates and his disposition. The reports required by this section shall be made upon forms furnished by the authority or according to an outline furnished by it. When a person has been committed to the authority, the court and the prosecuting and police authorities and other public officials shall make available to the authority all pertinent data in their possession in respect to the case.