The majority of any California appellate panel is permitted to certify an opinion for publication that establishes new law or modifies existing rules. The California Supreme court can reverse any publication decision without giving any reason. This practice is called "pocket review." Pocket reviews risk thwarting legislative intent and sweeping the results under the rug.
Steven B. Katz,
California's Curious Practice of "Pocket Review",
3 J. App. Prac. & Process 385
Available at: http://lawrepository.ualr.edu/appellatepracticeprocess/vol3/iss1/18