Seriously? you don't feel a LEO has any business knowing if someone he pulls over has a firearm?
Here in MA:
1) the law does not require me to tell him.
2) I've known people who told the officer they were carrying and then wound up facing the wrong end of a .40 Glock, were dragged out of their car, proned out on pavement, disarmed, cuffed, and stuffed into the back of the cruiser for ~1 hour. Eventually, they were given their traffic citation, their gun, and let free.
3) A friend of mine is an ICE agent. He knows another ICE agent and an FBI agent who were off duty when they were stopped by MA State Police in routine traffic stops. They identified themselves as federal agents and showed their badge and ID to the statie. The statie then told them that their federal badge did not allow them to carry concealed and wanted to disarm them. They spent about an hour on the side of the road until the statie's supervisor straightened him out. Note: I'm not implying that this is SOP for the MA State Police. I suspect it was just one particular Statie who was either a) ignorant, b) testosterone-poisoned, or c) both.
Some officers dont like to be surprised when you open your glove compartment to get a registration and a handgun falls out they werent execpting. I dont understand the big deal in letting the officer know you have a firearm in advance to avoid him being surprised. I was taught that by my uncle who was a LEO in MA, which is where I grew up.
I don't keep a gun in my glove compartment and I can retrieve my license and registration without displaying my gun. As for why is it a big deal in MA, see above.
If an officer tells me to get out of my car, then he is likely going to frisk me. At that point, I will tell him: "Certainly, officer. However, I have a license to carry and I am carrying now. How would you like to proceed."
But if he doesn't tell me to get out of the car, then I'm not volunteering unless I'm in a jurisdiction that requires it.
And if a LEO walks up to your car after a traffic stop and notices a firearm he knows you are a law abiding/legally carrying citzen on the spot how?
He won't notice it. I'm carrying concealed.