The attorney-client privilege in The Justice System, which ensures that a client can honestly communicate with an attorney in seeking advice and aid, is a cornerstone of the U.S. legal system. The privilege generally prevents an attorney from being compelled or even voluntarily disclosing information conveyed in confidence by a client for the purpose of seeking legal counsel.
In the justice system, when people are incarcerated, they should not expect much privacy. It is understood that law enforcement needs to be able to observe inmates, even listening in on their phone calls and reading their mail. However, law enforcement officials from prison guards to prosecutors know that there are certain privileges that even incarcerated individuals have, especially the attorney-client privilege.