Allowed with notice
Riverside Local Rule 3401 requires trial counsel to exchange witness and exhibit lists no later than 14 days before trial; undisclosed non-impeachment exhibits may be excluded.
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Not later than 14 days before the date set for trial ... counsel for all parties shall exchange ... A list of all exhibits that the party intends to introduce at trial
The requirement is stated in current official court rules and is attached at court scope, not as a personal preference.