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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.
This is appropriate for use if your attorney wants someone to testify for you at trial. However, if that person might do you more harm than good, your lawyer might elect to use a subpoena duces tecum instead. This is a demand for documentation the witness has in her possession.