What is the test for qualified immunity for a police officer in an assault case?

Even where a reviewing court, applying these principles, concludes that probable cause to arrest was lacking in a given case, an officer "will still be entitled to qualified immunity . . . if he can establish that there was 'arguable probable cause' to arrest." Escalera v. Lunn, 361 F.3d 737, 743 (2d Cir. 2004). "Arguable probable cause exists if either (a) it was objectively reasonable for the officer to believe that probable cause existed, or

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