The following excerpt is from Cobos v. Hunter, 19 F.3d 26 (9th Cir. 1994):
The Eighth Amendment prohibits punishment which involves the unnecessary and wanton infliction of pain, is grossly disproportionate to the severity of the crime or serves no justifiable penological interest. Rhodes v. Chapman, 452 U.S. 337, 346 (1981). Isolating an inmate under circumstances that warrant discipline is not necessarily unconstitutional. Hutto v. Finney, 437 U.S. 678, 685 (1978).
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