842
Opinion of the Court
sion here that a prison official who was unaware of a substantial risk of harm to an inmate may nevertheless be held liable under the Eighth Amendment if the risk was obvious and a reasonable prison official would have noticed it.
We are no more persuaded by petitioner's argument that, without an objective test for deliberate indifference, prison officials will be free to ignore obvious dangers to inmates. Under the test we adopt today, an Eighth Amendment claimant need not show that a prison official acted or failed to act believing that harm actually would befall an inmate; it is enough that the official acted or failed to act despite his knowledge of a substantial risk of serious harm. Cf. 1 C. Torcia, Wharton's Criminal Law § 27, p. 141 (14th ed. 1978); Hall 115. We doubt that a subjective approach will present prison officials with any serious motivation "to take refuge in the zone between 'ignorance of obvious risks' and 'actual knowledge of risks.' " Brief for Petitioner 27. Whether a prison official had the requisite knowledge of a substantial risk is a question of fact subject to demonstration in the usual ways, including inference from circumstantial evidence, cf. Hall 118 (cautioning against "confusing a mental state with the proof of its existence"), and a factfinder may conclude that a prison official knew of a substantial risk from the very fact that the risk was obvious. Cf. LaFave & Scott § 3.7, p. 335 ("[I]f the risk is obvious, so that a reasonable man would realize it, we might well infer that [the defendant] did in fact realize it; but the inference cannot be conclusive, for we know that people are not always conscious of what reasonable people would be conscious of"). For example, if an Eighth Amendment plaintiff presents evidence showing that a substantial risk of inmate attacks was "longstanding, pervasive, well-documented, or expressly noted by prison officials in the past, and the circumstances suggest that the defendant-official being sued had been exposed to information concerning the risk and thus 'must have known' about it, then such evidence could be sufficient to permit a trier of
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