In United States v. Salva-Morales, 660 F.3d 72 (2011), released today by the First Circuit, the court analyzed two important issues: (1) whether a defendant must have actual knowledge of child pornography and (2) how to prove interstate or foreign commerce. A total of 176 images of child pornography were found on the defendant's two computers.
Salva-Morales did not testify, but several witnesses claimed he was not the sole user of the computer. A fornesics examine testified that "one hard drive indicated that twenty-two different users...