I do agree that this was a violation of the 5th Amendment for Jackson. Even though she might not have been on the witness stand (or in a formal questioning arena) her position as a defendant in court means all the same to the 5th and the rules against self-incrimination still apply. Because of the fact that she was in custody/arrested and was on trial should be sufficient enough under any circumstance that inducing self-incrimination is a viable offense. She had clearly not given up her right through waiving it to testify herself and thus could not and should not be held to any coerced self-incriminating statements she might have said when pressed by the prosecution