This article is modeled on a panel discussion at the symposium regarding two hypothetical case studies: the first about detection technologies related to facial recognition and Terahertz detection and the second about passenger name recognition information created by airlines to manage travel reservations. Through this conversation, the panelists discuss the relationship of big data collection to Fourth Amendment jurisprudence, the implications of changing technology on the future of big data collections, and the privacy concerns associated with the increased use of these types of surveillance methods as related to law enforcement.