California EVIDENCE CODE SECTION 720-723 720.
Evidence Code 721. (a) Subject to subdivision (b), a witness testifying as an expert may be cross-examined to the same extent as any other witness and, in addition, may be fully cross-examined as to (1) his or her qualifications, (2) the subject to which his or her expert testimony relates, and (3) the matter upon which his or her opinion is based and the reasons for his or her opinion. (b) If a witness testifying as an expert testifies in the form of an opinion, he or she may not be cross-examined in regard to the content or tenor of any scientific, technical, or professional text, treatise, journal, or similar publication unless any of the following occurs: (1) The witness referred to, considered, or relied upon such publication in arriving at or forming his or her opinion. (2) The publication has been admitted in evidence. (3) The publication has been established as a reliable authority by the testimony or admission of the witness or by other expert testimony or by judicial notice. If admitted, relevant portions of the publication may be read into evidence but may not be received as exhibits.
Evidence Code 722. (a) The fact of the appointment of an expert witness by the court may be revealed to the trier of fact. (b) The compensation and expenses paid or to be paid to an expert witness by the party calling him is a proper subject of inquiry by any adverse party as relevant to the credibility of the witness and the weight of his testimony.
California Evidence Code 789. Evidence of his religious belief or lack thereof is inadmissible to attack or support the credibility of a witness.
California Penal Code 867. While a witness is under examination, the magistrate shall, upon motion of either party, exclude all potential and actual witness who have not been examined. The magistrate shall also order the witnesses not to converse with each other until they are all examined. The magistrate may also order, where feasible, that the witnesses be kept separated from each other until they are all examined.
US Supreme Court, Daubert v. Merrell Dow Pharmaceutical 509 U.S. 579 113 S.Ct. 2786 (1993), effectively made the standard in federal court, as well as many other courts, as Rule 702 of the Federal Rules of Evidence:
Chris Conrad, Cannabis cultivation, yields, dosages, collectives, dispensaries, illegal sales, and most things cannabis. Qualified as expert in 35 California counties, several other states, Federal, and Courts Martial. Mentioned favorably in California Supreme Court and Appeals Court rulings. Author of Cannabis Yields and Dosage.
Paul Armentano, Expert witness on drug testing
William Britt 562-818-0420, Expert on medical marijuana issues, Los Angeles, Southern California
Jason Browne 707-974-8264, Expert withess on medical marijuana issues, Northern California
Don Duncan, Expert witness on medical marijuana dispensaries
Dale Gieringer, Expert witness on drug testing
Brian Sedgwick Specializing in detection and toxicology
Zehnder, Jeffrey "drug detection laboratories" 916-366-3113
President / Director, Intermountain Forensic
If you wish to research the law without the assistance of a private attorney, you can visit the Internet web site http://www.leginfo.ca.gov/calaw.htm. where you can research California's laws online.
You may wish to consult the law librarian at your nearest law library. For the location of your county law library, please refer to your local telephone directory section on County Government Offices under "Law Library."
From Safe Access Now, basically for medical marijuana or marijuana cases in the state of California.
Lots of good links, referrals and information
This has a database of attorneys, you can read their resumes online.
California citizens, as well as out-of State citizens, may contact the Legal Services Department of the State Bar of California for referral to a local lawyer referral service at 415-561-8398.
Other resources for expert witnesses:
Safe Access Now: Guidelines for Medical Marijuana dosages and cultivation