The Fourth Amendment’s prohibition of “unreasonable searches” is one of the most storied constitutional commands Yet after decades of Supreme Court jurisprudence, a coherent definition of the term “search” remains surprisingly elusive Even the justices know they have a problem Recent opinions only halfheartedly apply the controlling “reasonable expectation of privacy” test and its wildly unpopular cousin, “third-party doctrine,” with a few justices in open revolt. These fissures hint at the Court’s openness to a new approach Unfortunately, no viable alternatives appear on the horizon The justices themselves offer little in the way of a replacement And scholars’ proposals exhibit the same complexity, subjectivity, and illegitimacy that perva...