California Code, Business and Professions Code - BPC § 2070

Notwithstanding any other provision of law, a medical assistant may perform venipuncture or skin puncture for the purposes of withdrawing blood upon specific authorization and under the supervision of a licensed physician and surgeon or a licensed podiatrist, or a physician assistant, a nurse practitioner, or a nurse-midwife as provided in subdivision (a) of Section 2069, if prior thereto the medical assistant has had at least the minimum amount of hours of appropriate training pursuant to standards established by the Division of Licensing.  The medical assistant shall be issued a certificate by the training institution or instructor indicating satisfactory completion of the training required.  A copy of the certificate shall be retained as a record by each employer of the medical assistant.