On August 19, the Louisiana Supreme Court ruled 4-3 that Shreveport Mayor Adrian Perkins should be on the ballot for re-election. Deal v Perkins. Here is the Opinion. The issue is whether the penalty for making clerical errors on candidacy declaration forms is to be blocked from the ballot or not.
The decision is based on statutory construction.
I guess ballot access for a major party candidate is more like guidelines then actual rules.