(725 ILCS 220/1)
(from Ch. 38, par. 156-1)
"Witness" as used in this Act shall include a person whose
testimony is desired in any proceeding or investigation by a grand jury or
in a criminal action, prosecution or proceeding.
The word "summons" shall include a subpoena (both subpoena ad
testificandum and subpoena duces tecum), order or other notice requiring
the appearance of a witness.
(Source: Laws 1965, p. 2694.)