California Code, Business and Professions Code - BPC § 26050

(a) The license classification pursuant to this division shall, at a minimum, be as follows:

(b) With the exception of testing laboratory licenses, which may be used to test cannabis and cannabis products regardless of whether they are intended for use by individuals who possess a physician's recommendation, all licenses issued under this division shall bear a clear designation indicating whether the license is for commercial adult-use cannabis activity as distinct from commercial medicinal cannabis activity by prominently affixing an “A” or “M,” respectively.  Examples of such a designation include, but are not limited to, “A-Type 1” or “M-Type 1.” Except as specifically specified in this division, the requirements for A-licenses and M-licenses shall be the same.  For testing laboratories, the department shall create a license that indicates a testing laboratory may test both adult-use and medicinal cannabis.

(c) A license issued pursuant to this division shall be valid for 12 months from the date of issuance.  The license may be renewed annually.

(d) The department shall establish procedures for the issuance and renewal of licenses.