Tape recordings of an interview between a government agent and a government witness is producible under the Jencks Act after the witness has testified, if the recording relates to the witness' testimony. Composite drawings made from photographs are not producible. Photographs, if they relate to a witness' statement must be produced. Notes taken by a prosecutor or a law enforcement officer pertaining to an interview with a potential government witness may be subject to production under the Jencks Act if the witness testifies at trial.