What is the scope of a search warrant for a convicted sex offender who failed to register as a registered sex offender?

focused not on his failure to register but on his activities involving young boys and suspected involvement with child pornography. Mere mention of the crime that prompted the investigation will not ensure that an authorization to search for evidence relating to that crime is more than an insignificant or tangential element of a warrant focused on evidence of other criminal activity. See, e.g., Cassady v. Goering, 567 F.3d 628, 636 (10th Cir. 2009). Rather, the court must assess the relative importance on the face of the warrant of the valid and invalid provisions, weigh the body of evidence that could have been seized pursuant to the invalid portions of the warrant against the body of evidence that could properly have been seized pursuant to the clauses that were sufficiently particularized, and consider such other factors as it deems appropriate in reaching a conclusion as to whether the valid portions comprise more than an insignificant or tangential part of the warrant.