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Thus, a person called to testify before Congress can refuse if they believe the government could use the testimony against them in criminal proceedings. To render the protections against self-incrimination ineffective, Congress can provide immunity from criminal prosecution.
1 The subpoena can also request the testimony to be given by phone or in person. 2  subpoena duces tecum orders a person or organization to bring physical evidence before the ordering authority or face punishment. 3  This is often used for requests to mail copies of documents to the requesting party or directly to court. subpoena ad testificandum orders a person to testify before the ordering authority or face punishment. 2  The subpoena can also request the testimony to be given by phone or in person. 3  subpoena duces tecum orders a person or organization to bring physical evidence before the ordering authority or face punishment.