ST. CHARLES, Ill. (AP) -- A convicted sex offender was sentenced to four years in prison for unlawfully working in a school.

   Authorities say 41-year-old Gary L. Gasper of Elgin reported to his job as a temporary food service worker last month at a Batavia middle school. He'd been hired by an independent contractor.

   Police say Gasper acted odd about signing a guest register in the school's office. So a police liaison checked his name against the sex offender registry and found a 1992 conviction in Wisconsin for sexually assaulting a 9-year-old.

   Batavia police say they have no evidence Gasper had any contact with students.

   He pleaded guilty in Kane County to being present within a school zone as a child sex offender.

   (Copyright 2007 by The Associated Press.  All Rights Reserved.)

   APTV 12-06-07 2007CST