Which Supreme Court case determined that prisons should only restrict the rights of prisoners if it was substantially related to a legitimate concern of the prison?

Question

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Turner v. Safley (1987) established that the rights of prisoners can be restricted only if the restrictions are related to legitimate concerns of the prison, such as security. This decision set a standard for evaluating the constitutionality of prison regulations affecting inmates' constitutional rights.

Which Supreme Court Case Determined That Prisons Should Only Restrict