California, United States of America
The following excerpt is from People v. Knox, B237213 (Cal. App. 2014):
Whether a party exercised reasonable diligence to locate a missing witness is a mixed question of law and fact. (People v. Cromer, supra, 24 Cal.4th at pp. 894, 901.) We defer to the trial court's determination of the historical facts of what the prosecution did to locate an absent witness, but independently review whether those efforts amount to reasonable diligence sufficient to sustain a finding of unavailability. (Id. at pp. 900-901.)
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