(a) The drug education and counseling requirements under Sections 11357, 11358, 11359, and 11360 shall be:
(1) Mandatory, unless the court finds that such drug education or counseling is unnecessary for the person, or that a drug education or counseling program is unavailable;
(2) Free to participants, and shall consist of at least four hours of group discussion or instruction based on science and evidence-based principles and practices specific to the use and abuse of cannabis and other controlled substances.
(b) For good cause, the court may grant an extension of time not to exceed 30 days for a person to complete the drug education and counseling required under Sections 11357, 11358, 11359, and 11360.