Ohio has the requirement to inform, and they drill into you in the CCW course to make sure you *practice* what you are going to tell the officer. They've had far too many people panic, get tongue tied, and just start gesturing and saying "gun."
The side effect of this is that every time I have a dream that involves getting pulled over, I now recite in my dream the specific sequence of "Officer I am a CCW permit holder and I am carrying on the right hip. My permit and my license are in my wallet which are also on my right hip pocket."
It ends up being a little pointless, though, since the license shows up when they run your plates. I've had several friends whose fathers had permits say that they were planning on getting theirs, just because every time they were pulled over the cops treated them like they were armed anyway.