Cal. Penal Code § 13103

Notwithstanding any other provisions of law relating to retention of public records, any criminal justice agency may cause the original records filed pursuant to this chapter to be destroyed if all of the following requirements are met: (a) The records have been reproduced onto microfilm or optical disk, or by any other techniques which do not permit additions, deletions, or changes to the original document. (b) If the records have been reproduced onto optical disk, at least one year has elapsed since the date of registration of the records. (c) The nonerasable storage medium used meets the minimum standards recommended by the National Institute of Standards and Technology for permanent record purposes. (d) Adequate provisions are made to ensure that the nonerasable storage medium reflects additions or corrections to the records. (e) A copy of the nonerasable storage medium is maintained in a manner which permits it to be used for all purposes served by the original record. (f) A copy of the nonerasable storage medium has been stored at a separate physical location in a place and manner which will reasonably assure its preservation indefinitely against loss or destruction.