California, United States of America
The following excerpt is from Trader Joe's Co. v. AAP Holding Co., D076018 (Cal. App. 2020):
A defendant may be held liable under aiding and abetting principles for an intentional tort committed by another person if the defendant had actual knowledge that a tort is being or will be committed, provided substantial assistance or encouragement to the actor, and defendant's conduct was a substantial factor in causing plaintiff's harm. (Casella v. SouthWest Dealer Services, Inc. (2007) 157 Cal.App.4th 1127, 1140-1141.)
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