Under Louisiana conceal carry statutes, the permit holder must declare their permit and weapon if approached in an official manner by a LEO. They must also willingly hand it over if requested:
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.
Most Louisiana LEOs are very respectful and agreeable. Occasionally they can be scary.
Also, in Louisiana, our vehicles are considered an extension of our residence, and thereby we can carry loaded weapons openly displayed OR concealed.
An example of how it should go in Louisiana:
My brother-in-law was stopped near New Orleans, and when the officer saw his .357 Mag revolver on the console he asked "Is that loaded?" to which my brother-in-law responded, "ABSOLUTELY!" The state trooper then asked, "Why do you have it?" My bro-in-law answered something to the effect of,"Self Protection", the trooper then said, "OK", and that was it.