The California Material Witness Information Sheet is a form used by prosecutors in criminal proceedings to document the identity of witnesses who have provided material information in a criminal case. The form is used to track the whereabouts of the witness and to ensure that the witness does not change their story or become unavailable to testify. The California Material Witness Information Sheet is a two-page document which includes the name, address, and contact information of the witness, as well as any other relevant information. There are two types of California Material Witness Information Sheet: one for witnesses who have provided material information to a criminal investigation, and one for witnesses who have provided material information to a civil investigation. Both forms are used to provide information to the court to ensure that the witness is available and can be contacted when needed.