In what circumstances will a prison officer be found guilty of failing to provide adequate medical care to a patient?

medical care." Jett v. Penner, 439 F.3d 1091, 1096 (9th Cir. 2006) (the prisoner must show a purposeful act or failure to respond to his pain or medical need and resulting harm caused by the indifference). If the risk of harm was obvious, the trier of fact may infer that a defendant knew of the risk, but obviousness per se will not impart knowledge as a matter of law. Farmer, 511 U.S. at 840-42. Even "[i]f a prison official should have been aware of the risk, but was not, then the official has not violated the Eighth Amendment, no matter how severe the risk." Id. at 834.