Here is how it's written on the Louisiana State Police website:
Duties of Permittees
The permit shall be retained by the permittee who shall immediately produce it upon the request of any law enforcement officer. Anyone who fails to do so shall be fined not more than one hundred dollars. Additionally, when any peace officer approaches a permittee in an official manner or with an identified purpose, the permittee shall:
1. Notify the officer that he has a weapon on his person;
2. Submit to a pat down;
3. Allow the officer to temporarily disarm him.
The bold is my emphasis, but note by omission it tends to suggest that if the permittee is the one who approaches the officer he doesn't have the duty to inform. WARNING AND NOTICE.....THERE'S NO WAY I'D SUGGEST TESTING THAT "LOOPHOLE".........wherever you are, and no matter who approaches who, if it's business and your state requires it, just let the nice officer know you are carrying in a non-threatening way. I've never tasted roadside gravel and don't intend to.