California Code, Business and Professions Code - BPC § 114

(a) Notwithstanding any other provision of this code, any licensee or registrant of any board, commission, or bureau within the department whose license expired while the licensee or registrant was on active duty as a member of the California National Guard or the United States Armed Forces, may, upon application, reinstate their license or registration without examination or penalty, provided that all of the following requirements are satisfied:

(b) If application for reinstatement is filed more than one year after discharge or return to inactive status, the applicant, in the discretion of the licensing agency, may be required to pass an examination.

(c) If application for reinstatement is filed and the licensing agency determines that the applicant has not actively engaged in the practice of the applicant's profession while on active duty, then the licensing agency may require the applicant to pass an examination.

(d) Unless otherwise specifically provided in this code, any licensee or registrant who, either part time or full time, practices in this state the profession or vocation for which the licensee or registrant is licensed or registered shall be required to maintain their license in good standing even though the licensee or registrant is in military service.

For the purposes in this section, time spent by a licensee in receiving treatment or hospitalization in any veterans' facility during which the licensee is prevented from practicing the licensee's profession or vocation shall be excluded from said period of one year.