What is the current state of the law on rectum searches in prison?

"By 1984, it was clearly established that the [f]ourth [a]mendment requires that rectal searches in prison be conducted with reasonable cause and in a reasonable manner.... A violation of the [f]ourth [a]mendment may be predicated on a finding either that cause was lacking or that the search was conducted in an unreasonable manner." Vaughan, 950 F.2d at 1468-69 (citing Bell v. Wolfish, 441 U.S. 520, 559 (1979)). Moreover, prisoners have a clearly established right to be free from digital rectal searches conducted for purposes unrelated to legitimate penological concerns. Tribble, 860 F.2d at 325-27. A digital rectal search also may violate the eighth amendment if it is not related to any legitimate penological concerns. See id. at 325 n. 6.