California, United States of America
The following excerpt is from People v. Buenrostro, B230967, B240440 (Cal. App. 2013):
Evidence of a relationship, such as common membership in an organization between a witness and a party is admissible to show bias. But when other evidence has established such a relationship, then evidence of common membership is cumulative, and if it is prejudicial, is inadmissible. (People v. Maestas, supra, 20 Cal.App.4th at p. 1495.)
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