California, United States of America
The following excerpt is from People v. Passineau, H036276 (Cal. App. 2012):
"Although the complete exclusion of evidence intended to establish an accused's defense may impair his or her right to due process of law, the exclusion of defense evidence on a minor or subsidiary point does not interfere with that constitutional right. [Citation.] Accordingly such a ruling, if erroneous, is 'an error of law merely,' which is governed by the standard of review announced in People v. Watson (1956) 46 Cal.2d 818, 836."
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