Well... before we all set our hair on fire, there are a couple of key points that should be mentioned:
1. I tracked down this piece of legislation (link below). This isn't a new bill. The bill (HB 195) this article refers to is actually an amendment to previously existing legislation which has apparently been around since 1950! HB 195 was made law in 2011 so it has been around for about 4 years.
2. The key portion, as it pertains to us garage sale junkies, is in the Definitions, Section 1861A.(1), which reads, in pertinent part:
"Anyone, other than a nonprofit entity, who buys, sells, trades in, or otherwise acquires or disposes of junk or used or secondhand property more frequently than once per month from any other person, other than a nonprofit entity, shall be deemed as being engaged in the business of a secondhand dealer."
In other words, people who have a garage sale once in a while are not subject to this law.
3. It is one thing to have a law on the books. It is quite another to enforce it. That being said, this does seem rather burdensome to people who run thrift stores and the like. I wonder how many are aware of, and actually comply with, the provisions of this law. I would wager very few.
Here is the link to the actual legislation:
https://legiscan.com/LA/text/HB195/id/343620