What is the test of reasonableness for a police officer to use force against an unarmed man?

Plaintiffs do not and cannot dispute these facts. And while they may dispute the significance of them, the law is quite clear: "An officer ' "may use reasonable force to make an arrest, prevent escape or overcome resistance, and need not desist in the face of resistance." ' [Citation.]" (Brown v. Ransweiler (2009) 171 Cal.App.4th 516, 527 (Brown).) "The test of reasonableness in this context is an objective one, viewed from the vantage of a reasonable officer on the scene. It is also highly deferential to the police officer's need to protect himself and others: 'The "reasonableness" of a particular use of force must be judged from the perspective of a reasonable officer on the scene, rather than with the 20/20 vision of hindsight. [Citation.] . . . The calculus of reasonableness must embody allowance for the fact that police officers are often forced to make split-

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