There are exceptions if a witness is granted use or transactional immunity, such that what he says cannot be used against him (use immunity) or he has received full immunity for any prosecution for the underlying crime or transaction (transactional immunity). If the witness has immunity, then he cannot refuse to answer questions when ordered to do so by a judge. | There are exceptions if a witness is granted use or transactional immunity, such that what he says cannot be used against him (use immunity) or he has received full immunity for any prosecution for the underlying crime or transaction (transactional immunity). If the witness has immunity, then he cannot refuse to answer questions when ordered to do so by a judge. |