Under what circumstances will a prison administrator be permitted to strip and cavity search a pretrial detainee in a strip search?

Id. at 546 n. 28, 99 S.Ct. at 1878 n. 28 (citations omitted). Given the difficulties inherent in prison administration, prison administrators are to be "accorded wide-ranging deference in the adoption and execution of policies and practices that in their judgment are needed to preserve internal order and discipline and to maintain institutional security." Id. at 547, 99 S.Ct. at 1878. Accordingly, whatever Fourth Amendment rights pretrial detainees retain have been held uninfringed by such security measures as strip and body-cavity searches, see id. at 558-60, 99 S.Ct. at 1884-85, and the monitoring of their conversations with visitors, see Christman v. Skinner, 468 F.2d 723, 726 (2d Cir.1972).