Cal. Food & Agric. Code § 81006

(a) Except when grown by a registered established agricultural research institution or a registered hemp breeder, industrial hemp shall be grown in acreages of not less than one-tenth of an acre at the same time.

(b) Clandestine cultivation of industrial hemp is prohibited. All plots shall have adequate signage indicating they are industrial hemp.

(d) Industrial hemp shall include products imported under the Harmonized Tariff Schedule of the United States (2013) of the United States International Trade Commission, including, but not limited to, hemp seed, per subheading 1207.99.03, hemp oil, per subheading 1515.90.80, oilcake, per subheading 2306.90.01, true hemp, per heading 5302, true hemp yarn, per subheading 5308.20.00, and woven fabrics of true hemp fibers, per subheading 5311.00.40.

(3) The sample collected for THC testing shall be taken with the grower or hemp breeder present. The department shall establish, by regulation, the sampling procedures, including all of the following: (A) The number of plants to be sampled per field, and any compositing of samples. (B) The portions of the plant to be sampled. (C) The plant parts to be included in a sample. (D) Additional procedures as necessary to ensure accuracy and the sanitation of samples and fields. (4) The sample collected for THC testing shall be accompanied by the registrant’s proof of registration. (5) The laboratory test report shall be issued by a laboratory approved by the department, using a department-approved testing method. The testing method shall use postdecarboxylation or similarly reliable methods for determining THC concentration levels. The laboratory test report shall indicate the percentage concentration of THC on a dry-weight basis, indicate the date and location of samples taken, and state the Global Positioning System coordinates and total acreage of the crop. If the laboratory test report indicates a percentage concentration of THC that is equal to or less than 0.3 percent, the words “PASSED AS CALIFORNIA INDUSTRIAL HEMP” shall appear at or near the top of the laboratory test report. If the laboratory test report indicates a percentage concentration of THC that is greater than 0.3 percent, the words “FAILED AS CALIFORNIA INDUSTRIAL HEMP” shall appear at or near the top of the laboratory test report. The laboratory test report shall also include an estimate of the measurement of uncertainty associated with the test results. A laboratory shall use appropriate, validated methods and procedures for all testing activities and estimates of the measurement of uncertainty. (6) If the laboratory test report indicates a percentage concentration of THC that is equal to or less than 0.3 percent, the laboratory shall provide the person who requested the testing not less than 10 original copies signed by an employee authorized by the laboratory and shall retain one or more original copies of the laboratory test report for a minimum of two years from its date of sampling. (7) If the laboratory test report indicates a percentage concentration of THC that is greater than 0.3 percent and does not exceed 1 percent, the registrant that grows industrial hemp shall submit additional samples for testing of the industrial hemp grown. (8) A registrant that grows industrial hemp shall destroy or dispose of the industrial hemp grown upon receipt of a first laboratory test report indicating a percentage concentration of THC that exceeds 1 percent or a second laboratory test report pursuant to paragraph (7) indicating a percentage concentration of THC that exceeds 0.3 percent but is less than 1 percent. If the percentage concentration of THC exceeds 1 percent, the destruction or disposal shall begin within 48 hours, and be completed within seven days, after receipt of the laboratory test report. If the percentage concentration of THC in the second laboratory test report exceeds 0.3 percent but is less than 1 percent, the destruction or disposal shall take place as soon as practicable, but no later than 45 days after receipt of the second test report. (9) A registrant that intends to grow industrial hemp and who complies with this section shall not be prosecuted for the cultivation or possession of marijuana as a result of a laboratory test report that indicates a percentage concentration of THC that is greater than 0.3 percent but does not exceed 1 percent. (10) A registered established agricultural research institution or a registered hemp breeder shall obtain laboratory results in accordance with its approved research plan or variety development plan. The secretary may authorize a registered established agricultural research institution or hemp breeder to cultivate or possess industrial hemp with a laboratory test report that indicates a percentage concentration of THC that is greater than 0.3 percent in accordance with its approved research plan or variety development plan if that cultivation or possession contributes to the development of types of industrial hemp that will comply with the 0.3 percent THC limit established in this division. (11) A registrant that grows industrial hemp shall retain an original signed copy of the laboratory test report for two years from its date of sampling, make an original signed copy of the laboratory test report available to the department, the commissioner, or law enforcement officials or their designees upon request, and shall provide an original copy of the laboratory test report to each person purchasing, transporting, or otherwise obtaining from the registrant that grows industrial hemp the fiber, oil, cake, or seed, or any component of the seed, of the plant.