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 Opinion of ALITO, J., which authorizes but imposes detailed restrictions on electronic surveillance. See ibid.

Modern cell phones are of great value for both lawful and unlawful purposes. They can be used in committing many serious crimes, and they present new and difficult law enforcement problems. See Brief for United States in No. 13-212, pp. 2-3. At the same time, because of the role that these devices have come to play in contemporary life, searching their contents implicates very sensitive privacy interests that this Court is poorly positioned to understand and evaluate. Many forms of modern technology are making it easier and easier for both government and private entities to amass a wealth of information about the lives of ordinary Americans, and at the same time, many ordinary Americans are choosing to make public much information that was seldom revealed to outsiders just a few decades ago.

In light of these developments, it would be very unfortunate if privacy protection in the 21st century were left primarily to the federal courts using the blunt instrument of the Fourth Amendment. Legislatures, elected by the people, are in a better position than we are to assess and respond to the changes that have already occurred and those that almost certainly will take place in the future.