The Fourth Amendment of the U.S. Constitution provides protection to all people from unreasonable search and seizure of their person, home, papers and effects. In the more than 200 years since this document was drafted, a lot has changed in terms of how we define privacy. In the modern era, there is a question of whether "papers and effects" also encompasses property such as digital data.
It may have been late when you were speeding home or maybe your license plates were expired. Whatever the reason, you knew you'd be explaining your situation with an officer when you saw the police lights in your rearview mirror. As you were motioned to drive to the road's shoulder, you reviewed the lessons you'd been taught about interaction with law enforcement: speak respectfully to the officer, clearly explain your situation, avoid making quick moves and stay calm.