What is the test for determining whether a use of force violated the Eighth Amendment?

The following factors are relevant to a determination of whether a use of force violated the Eighth Amendment: (1) the need for the use of force; (2) the relationship between the need for force and the amount used; (3) the extent of injury inflicted; (4) the extent of the threat the officers reasonably perceived the plaintiff to pose to staff and inmate safety; and (5) any efforts made to temper the severity of the forceful response. Whitley v. Albers, 475 U.S. 312, 321 (1986).

To succeed on an Eighth Amendment claim predicated on the denial of medical care, a plaintiff must establish that he had a serious medical need and that the defendant's response to that need was deliberately indifferent. Jett v. Penner, 439 F.3d 1091, 1096 (9th Cir. 2006); see

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