As opposed to where the law has been, here is where it is and where it's going:  The November 2006 United States Attorney's Bulletin, published by the US Department of Justice.

Quote - Conclusion
The successful prosecution of Dwight Whorley demonstrates how innovative employment of obscenity statutes, in conjunction with a thorough computer forensic analysis, can be used to contain a dangerous individual and help ensure the safety of the children in our communities. Section 1466A allows federal prosecutors to pursue all cases involving visual depictions of minors engaging in sexually explicit conduct regardless of how those visual depictions
were produced. Accordingly, not only should federal prosecutors use the statute to prosecute
cases involving cartoons, as in Dwight Whorley's case, but they should also consider using the
statute to prosecute cases that may be difficult to prosecute under 18 U.S.C. §§ 2252 and 2252A, for example, where it may be difficult to establish that the children depicted in the images are real.

This law is current, applies to the entire US, and is actively enforced - feel free to write your legislator, or consult your local FBI office (I did). 

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