The Fourth Amendment guarantees that every person shall be "secure in their persons, houses, papers, and effects, against unreasonable searches and seizures." This means government agents cannot enter your home or rifle through your stuff without a warrant, signed by a judge and based on probable cause. That right extends to the digital sphere: The Supreme Court ruled in 2018's Carpenter v. United States that the government must have a warrant to track people's movements through their cellphone data.
But governments are increasingly circumventing these protections by using taxpayer dollars to pay private companies to spy on citizens. Government agencies have found many creative and enterprising ways to skirt the Fourth Amendment.
