Popov v. Hayashi, No. 400545, 2002 WL 31833731 (Cal. Super. Ct. Dec. 18, 2002)
Popov v. Hayashi is a modern staple of Property law that revisits classic first-possession disputes—think Pierson v.
Did Popov acquire a property interest sufficient to support a conversion claim when he made a significant but incomplete attempt to catch the baseball that was interrupted by unlawful crowd interference, and if so, how should the court resolve competing claims between Popov and the later, good-faith possessor, Hayashi?
Possession of abandoned personal property (such as a baseball hit into the stands) requires control with intent to possess. Under Gray's Rule, a ball is possessed only when the would-be catcher has complete control of it and both the ball's and the catcher's momentum have ceased; if the ball is dislodged before that moment, possession is not achieved. However, when an actor undertakes significant but incomplete steps to achieve possession of abandoned property and is prevented from fully possessing it by the unlawful acts of others, the actor acquires a legally cognizable pre-possessory interest—a qualified right to possession that can support a conversion claim. Conversion in California requires the plaintiff's ownership or right to possession at the time of conversion and the defendant's wrongful act or disposition of the property inconsistent with that right; good faith is generally not a defense, but equitable principles may shape the remedy when multiple innocent parties have colorable claims.
Popov did not achieve full possession under Gray's Rule, but his effort was interrupted by unlawful acts, creating a pre-possessory interest sufficient to support a conversion claim. Hayashi later obtained actual possession without wrongdoing. Because neither party had a superior claim to the entire ball, the court ordered the ball sold and the proceeds divided equally between Popov and Hayashi.
Popov v. Hayashi is central to Property courses for three reasons. First, it modernizes the first possession framework with a context-specific standard (Gray's Rule) for when possession occurs in chaotic environments. Second, it introduces the pre-possessory interest—an equitable concept that protects would-be possessors from the consequences of unlawful interference even when full possession is not achieved. Third, it demonstrates how courts may blend property doctrine and equitable remedies (like equitable division) when multiple innocent claimants have colorable claims and a clean allocation would either reward wrongdoing or unduly punish a good-faith possessor. The case thus bridges classical cases on capture and finders with real-world, policy-sensitive adjudication.