That's in IL
Every state has different laws.
Most states require that you report it if you find it. (some states have protections additionally if you don't find it and return it). On the federal level, if you are a telcom or service provider, and find it, you must report it to the National Center for Missing and Exploited Children.
said by jaa:
I don't know what I would do if I found child porn, fraud, or other indicator of illegal activity on a computer.
First, check the law in your state.
Food for thought:
No law was broken by Joe Paterno either and thus why he wasn't charged. In fact, he followed the law to the letter for it's reporting requirements.