California Labor Codes 5703 1081
§ Additional evidence allowed
The appeals board may receive as evidence either at or subsequent to a hearing, and use as proof of any fact in dispute, the following matters, in addition to sworn testimony presented in open hearing:
(a) Reports of attending or examining physicians. (1) Statements concerning any bill for services are admissible only if made under penalty of perjury that they are true and correct to the best knowledge of the physician. (2) In addition, reports are admissible under this subdivision only if the physician has further stated in the body of the report that there has not been a violation of Section 139.3 and that the contents of the report are true and correct to the best knowledge of the physician. The statement shall be made under penalty of perjury.
(b) Reports of special investigators appointed by the appeals board or a workers' compensation judge to investigate and report upon any scientific or medical question.
(c) Reports of employers, containing copies of timesheets, book accounts, reports, and other records properly authenticated.
(d) Properly authenticated copies of hospital records of the case of the injured employee.
(e) All publications of the Division of Workers' Compensation.
(f) All official publications of the State of California and United States governments.
(g) Excerpts from expert testimony received by the appeals board upon similar issues of scientific fact in other cases and the prior decisions of the appeals board upon similar issues.
(h) Relevant portions of medical treatment protocols published by medical specialty societies. To be admissible, the party offering such a protocol or portion of a protocol shall concurrently enter into evidence information regarding how the protocol was developed, and to what extent the protocol is evidence-based, peer-reviewed, and nationally recognized. If a party offers into evidence a portion of a treatment protocol, any other party may offer into evidence additional portions of the protocol. The party offering a protocol, or portion thereof, into evidence shall either make a printed copy of the full protocol available for review and copying, or shall provide an Internet address at which the entire protocol may be accessed without charge.