§ 2030.070.Supplemental interrogatories; limitations and restrictions;

Discovery and litigation both move over time, and an answer that was accurate when given can go stale as a case develops. This section addresses that reality by carving supplemental interrogatories out from the ordinary interrogatory limits altogether: they do not count against the 35-question cap in Section 2030.030 or the extra allowance under Section 2030.040, because their only job is to ask what has changed since a previous answer, not to open new subject matter.

The statute rations how often a party can use this tool without court permission. A supplemental interrogatory may go out twice before a trial date is first set, and once more after that, subject to the overall discovery-completion deadlines in Chapter 8. That default allotment covers most cases, where facts settle down as trial nears, but subdivision (c) leaves room for more: on a motion showing good cause, a court can grant leave for additional supplemental interrogatories beyond the two-before, one-after default, useful in a case where a long delay before trial, or a late-emerging factual development, calls for another update.