35 Ill. Adm. Code 745.127
Registered or Certified Mail
Section 745
Section 745.127 Registered
or Certified Mail
All prior conduct certification
applications shall be mailed or delivered to the appropriate address designated
by the Agency, and, if mailed, shall be sent by registered or certified mail,
return receipt requested. Applications which are hand-delivered shall be
delivered to and receipted for by a person designated by the Agency.