Art. 1459.Interrogatories to Parties; Scope; Use At Trial

Article 1459 is short but does real work: it defines what interrogatories can ask about by pointing to Louisiana's general discovery-scope articles, which allow inquiry into any relevant, non-privileged matter bearing on the case. Rather than repeat that standard, this article incorporates it, so the scope of permissible interrogatories tracks the scope of discovery generally.

The second half addresses what happens to the answers later. Once a party has sworn to an interrogatory answer, that answer can be offered at trial -- most often to show what the answering party has already admitted, or to highlight an inconsistency with later testimony. But this article doesn't make every answer automatically admissible; ordinary evidentiary rules on relevance, hearsay, and the like still apply to whether and how the answer comes in.