ctronic devices. The question we confront "is what limits there are upon this power of technology to shrink •957 the realm of guaranteed privacy." Kyllo v. United States, 533 U.S. 27, 34, 121 S.Ct. 2038, 150 L.Ed.2d 94 (2001). More specifically, we consider the reasonableness of a computer search that began as a cu