Title 24, Chapter 10, Section 91
As used in this article, the term:
(1) "Penal institution" means a jail, prison, penitentiary, house
of correction, or other place of penal detention.
(2) "State" means any state or territory of the United States and
the District of Columbia.
(3) "Summons" means a subpoena, order, or other notice requiring
the appearance of a witness.
(4) "Witness" means a person whose testimony is desired in any
proceeding or investigation by a grand jury or in a criminal
action, prosecution, or proceeding held by the prosecution or the
defense, including a person who is confined in a penal institution
in any state.