In General Public Use: An Unnecessary Test to Determine Whether the Use of Advanced Sensing Technology was a Fourth Amendment Search

By Mike Petridis

I.       Introduction

Kyllo v. United States[1] created a rule with an unnecessary test that allows a home, a person’s castle, to be searched without a warrant.  The Kyllo rule states: “[O]btaining by sense-enhancing technology any information regarding the interior of the home that could not otherwise have been obtained without physical ‘intrusion into a constitutionally protected area’ constitutes a search — at least where . . . the technology in question is not in general public use.”[2]  This rule was intended to be forward-looking and anticipate future technology.[3]  However, the “general public use” test is a loophole that can be used by law enforcement officers to conduct warrantless searches of homes in violation of Fourth Amendment principles.

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