2020 New York Laws
CPL - Criminal Procedure
Part 3 - Special Proceedings and Miscellaneous Procedures
Title R - Procedures for Securing Attendance of Witnesses in Criminal Actions
Article 650 - Securing Attendance as Witnesses of Prisoners Confined in Institutions of Other Jurisdictions of the United States-Rendition to Other Jur
650.20 - Securing Attendance of Prisoner Outside the State as Witness in Criminal Action in the State.

§  650.20   Securing attendance of prisoner outside the state as witness
           in criminal action in the state.
1.  When (a) a criminal action is pending in a court of record of this
  state, or a grand jury proceeding has been commenced, and (b)  there  is
  reasonable  cause  to  believe  that a person confined in a correctional
  institution or prison of another state, other  than  a  person  awaiting
  execution of a sentence of death or one confined as mentally ill or as a
  defective  delinquent,  possesses  information material to such criminal
  action or proceeding, and (c) the attendance of such person as a witness
  in such action or proceeding is desired by a party thereto, and (d)  the
  state in which such person is confined possesses a statute equivalent to
  section  650.10, the court in which such action or proceeding is pending
  may issue a certificate under the seal of  such  court,  certifying  all
  such  facts  and that the attendance of such person as a witness in such
  court is required for a specified number of days.
2.  Such certificate may be issued upon  application,  of  either  the
  people  or  a  defendant,  demonstrating  all  the  facts  specified  in
  subdivision one.
3.  Upon issuing such a certificate, the  court  may  deliver  it,  or
  cause  or  authorize  it  to be delivered, to a judge or a court of such
  other state who or which, pursuant to the laws thereof, is authorized to
  initiate or undertake legal action for the delivery of such prisoners to
  this state as witnesses.