As used in this subchapter:
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(1) “Witness” means a person who is confined in a penal institution in any state and whose testimony is desired in another state in any criminal proceeding or investigation by a grand jury or in any criminal action before a court;
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(2) “Penal institutions” includes a jail, prison, penitentiary, house of correction, or other place of penal detention;
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(3) “State” includes any state of the United States, the District of Columbia, the Commonwealth of Puerto Rico, and any territory of the United States.