It was the NO police chief who ordered PD and National Guard (not sure how he could give them orders) to confiscate guns. Somewhere on youtube you can still see the video of five or six of NOPD's finest using force to confiscate a little old black lady's snub revolver in her kitchen. New Orleans PD makes it's own rules, always have, still do. NOPD is an acronym for Not Our Problem Dude.
In response Congressman (later Governor) Jindal and Senator Vitter sponsored legislation that became part of the 2007 Homeland Security appropriations prohibiting confiscation unless confiscation was allowed under federal law.