815 ILCS 505/5

(815 ILCS 505/5) (from Ch. 121 1/2, par. 265)

Sec. 5.

Service by the Attorney General of any notice requiring a person
to file a statement or report, or of a subpoena upon any person, shall be made

(a) personally by delivery of a duly executed copy thereof to the person
to be served, or if a person is not a natural person, in the manner
provided in the Civil Practice Law when a complaint is filed, or

(b) by mailing by certified mail a duly executed copy thereof to the
person to be served at his last known abode or principal place of business
within this State.

Service of any subpoena issued by a State's Attorney shall be made in
the manner provided in the Civil Practice Law.

(Source: P.A. 84-748.)