Defense attorneys who represent inmates at a privately run federal prison in Kansas were livid after learning that their meetings with clients had been recorded on video.

The recordings that came to light this month had no audio, but the attorney complaints raise the question of whether nonverbal interactions such as body language or the exchange of legal documents are protected under attorney-client privilege.

A federal judge says the videos might have violated the Sixth Amendment rights of hundreds of inmates in Leavenworth and ordered them stopped.

The company that runs the prison, Corrections Corporation of America, insists that silent video recordings of inmate-attorney meetings are a standard practice throughout the country and are used solely to enhance the prison's security.