California, United States of America
The following excerpt is from People v. Serna, H041769 (Cal. App. 2018):
the deferential substantial-evidence standard. [Citations.] Its decision on the second, which is a pure question of law, is scrutinized under the standard of independent review. [Citations.] Finally, its ruling on the third, which is a mixed fact-law question that is however predominantly one of law, viz., the reasonableness of the challenged police conduct, is also subject to independent review. [Citations.] The reason is plain: 'it is "the ultimate responsibility of the appellate court to measure the facts, as found by the trier, against the constitutional standard of reasonableness." ' " (People v. Williams (1988) 45 Cal.3d 1268, 1301.)
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