Parties use in a lawsuit use "discovery" to gather evidence, including depositions, interrogatories, and requests for documents and things. What is discovery and why is it necessary?Lawyer guide on motions to compel in Sacramento, California. This guide covers motions to compel interrogatories, document requests, and admissions. Discover all the great programs we offer. Speakers Bureau Request a DA speaker on various criminal justice topics. Practical Last Day to Serve Discovery (and be able to make a motion on it) – 90-100 days before trial. Specific information in the records. Requests for disclosure made to probation or pretrial services officers are improper. 15 days to produce the documents.