Utah recently passed a bill that requires a warrant for access to electronic information. This bill essentially makes electronic information, no matter where it's stored or by who, the equivalent of our physical possessions. For example, if I write a document and store it on DropBox, law enforcement in Utah must obtain a warrant to use that document as evidence, even if they are able to acquire the document from DropBox. In addition, the law requires that law enforcement notify me when they obtain my electronic information via a warrant.
This law creates a reasonable expectation of privacy for electronic information. I wish all other states had the same protections.