What is the test for a cause of action for unlawful detention or arrest?

A cause of action for unlawful detention or arrest requires a plaintiff to allege that (1) the defendant seized plaintiff's person, (2) the defendant acted intentionally, and (3) the seizure was unreasonable. Brower v. Cty. of Inyo, 489 U.S. 593, 599 (1989). "[A]n official with no official authority over another actor can also be liable for that actor's conduct if he induces that actor to violate a third party's constitutional rights, provided that the official possesses the requisite intent." Lacey v. Maricopa Cty., 693 F.3d 896, 916 (9th Cir. 2012).