They know you have a CCL when they run your drivers license and they can get upset that you did not tell them you had a weapon.
In LA, if the gun is concealed on your person, you MUST tell the LEO. OTOH, if it's in your car but NOT concealed on your person, I don't THINK you're required to tell them you have a concealed carry license. I don't know this for certain as I've never found it in writing either way. I'd welcome any further clarification from anyone who knows for certain.....