Fourth Amendment jurisprudence seeks equilibrium. When new technology frustrates the government’s ability to obtain evidence, “the Supreme Court generally adopts lower Fourth Amendment protections . . . to help restore the status quo ante level of government power.” Conversely, when new technology “makes evidence substantially easier for the government to obtain, the Supreme Court often embraces higher protections to help restore the prior level of privacy protection.” One need not search far back to find equilibrium-seeking in action—see Riley v. California, a Supreme Court decision of just this past term on the Fourth Amendment and cellphones.