CA has no legal requirement to inform LEOs that you are carrying. Several others states do have that requirement.
Some people believe it is better to tell the LEO that you have a gun rather than let him find it on his own, some do not.
"Did I say "republic?" By God, yes, I said "republic!" Long live the glorious republic of the United States of America. Damn democracy. It is a fraudulent term used, often by ignorant persons but no less often by intellectual fakers, to describe an infamous mixture of socialism, miscegenation, graft, confiscation of property and denial of personal rights to individuals whose virtuous principles make them offensive." - Westbrook Pegler