Sexual Predator Law Enforcement Procedures

Research the Protection of Children from Sexual Predators Act of 1998.

Answer the following:

I work for an ISP in the United States, and I have discovered child pornography on a Web site we host. What should I do?
I am investigating an incident where child pornography was found on a computer. The person who used the computer claims he
received a pop up containing child pornography and clicked on it. How can I determine whether the person’s story is true? Be
sure to provide details of the forensic procedures.
What challenges does law enforcement face in controlling Child Pornography? How can law enforcement deal with this problem?