As Librarian stated, LEOs are exempt. In fact, most LEOs in California carry sidearms that are not on the list because us regular citizens are restricted to 10 round mags. I don't know of any officer who carries less than the max available for a .40 Glock. This extends to off-duty arms. Most backups carried by officers are non-roster items, as there are very few pocket carry small pistols on the approved list. For example, no Nano, LCP, the S&W .380 micropistol, Kimber Solo, XDM series, Glock Gen 4, XDs etc are all off-roster. We can buy Shields, but officers can purchase and carry the non-California approved version (which are much easier to acquire).
As an aside, a new law on Brown's desk for signature will eliminate the ability of officers to sell off-roster arms to any one in a FTF transaction after two officers were arrested in Sacramento for making money as a side business selling such arms, and other officers in LA got in trouble for selling Kimber special edition SWAT pistols that they were getting for a real deal (like $500 if memory serves) and were reselling for $1500.