(a) The laboratory shall retain the reserve sample, consisting of any portion of a sample that was not used in the testing process. The reserve sample shall be kept, at minimum, for 45 business days after the analyses, after which time it may be destroyed and denatured to the point the material is rendered unrecognizable. (b) The laboratory shall securely store the reserve sample in a manner that prohibits sample degradation, contamination, and tampering. (c) The laboratory shall provide the reserve sample to the Bureau upon request. Authority: Section 26013, Business and Professions Code. Reference: Sections 26100, 26104 and 26110, Business and Professions Code .