"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
"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 th…