D.Ariz.: Failure to disclose fact ICE conducted a brief computer search finding no child porn was not a Franks violation where FBI didn’t know about it

The government did not commit a Franks violation by not disclosing that ICE conducted an on-site computer examination that revealed no child pornography. The FBI obtained a valid separate search warrant for the computers for a complete forensic investigation not knowing of the ICE examination. United States v. McKerlie, 2011 U.S. Dist. LEXIS 106091 (D. Ariz. July 7, 2011):

The Defendant alleges that Judge Pyle would not have issued the search warrant knowing that ICE’s on-site examination of the computer in April 2009 yielded no evidence of children pornography. The FBI affidavit, however, provided a sufficient explanation as to why an on-site examination such as the one conducted by ICE, could fail to locate child pornography present on a computer and the affidavit provided probable cause for a more in-depth search of the same computer. The warrant described numerous ways that child pornography is hidden on computers and the highly technical process and expertise required to detect the pornography. The affidavit explained why a detailed off-site search was often necessary to detect pornography. In one portion of the affidavit, the affiant stated: “Since computer evidence is extremely vulnerable to tampering or destruction (both from external sources or from destructive code embedded in the system as a ‘booby trap’), the controlled environment of a laboratory is essential to its complete and accurate analysis.” (Affidavit, p. 7.) In another section, the affiant described how computer experts can recover during a complete off-site forensic evaluation, deleted images, including images deleted years earlier: …

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