California Code, Business and Professions Code - BPC § 1281.1

It is unlawful for any person, including a person who owns, operates, or directs a clinical laboratory, to provide, offer, or solicit, any form of payment or gratuity for human blood or any other biological specimen provided for the purpose of clinical laboratory testing or clinical laboratory practice, unless the person is serving as an agent of a clinical laboratory or another facility legally utilizing those specimens only for purposes of research or teaching or for quality assurance purposes, or is an entity licensed under Chapter 4 (commencing with Section 1600) of Division 2 of the Health and Safety Code.