The waiver form included the charges against him and informed him of his Miranda rights, including his right to have an attorney present during questioning.
Executive Director Anthony Romero said the legal exception applies only when there is a continued threat to public safety and is "not an open-ended exception" to the Miranda rule, which guarantees the right to remain silent and the right to an attorney.
"In essence, although suspects interviewed pursuant to the program are told, through the Miranda warnings, that they have the right to remain silent, the preamble suggests that invoking that right will bear adverse, and irrevocable, consequences, " the court wrote.