A spoliation letter, sent promptly after a client relationship begins, puts the property owner and its insurer on notice of a specific legal obligation to preserve evidence relevant to reasonably anticipated litigation. California courts recognize that once a party is on notice of potential litigation, a duty to preserve relevant evidence arises, and destruction of evidence after that notice can support an adverse inference instruction or, in serious cases, separate discovery sanctions. Referring attorneys evaluating a new commercial injury referral should treat video preservation as a same-day task, not a task for after intake paperwork is finished. A phone call confirming an in-progress written request, followed immediately by a formal letter, protects the record even before a full case evaluation is complete.