Courtesy of fourthamendmentlaw.com here is an interesting summary of search law from the Oregon Federal Public Defender.
First he acknowledges that a persons privacy right has been restricted over the years and with the advent of technology privacy may get harder to protect.
The revolution of the Warren Court, especially in the area of search and seizure under the Fourth Amendment, was largely an expansion of federal constitutional rights in the face of state practices that limited the protection of individual rights embodied in the Bill of Rights. The following outline of federal cases construing the protections of the Fourth Amendment reflects a dynamic tension between the need to secure evidence to convict law breakers and the protection of citizens’ reasonable expectations of privacy. The result has been an overall contraction of privacy rights. This outline sets out basic principles and counterpoints from which criminal defense lawyers can fashion arguments for a more expansive view of the Fourth Amendment’s protections.