A federal district court has ruled, in U.S. v. Stanley, that a police officer did not violate the Fourth Amendment when he used software to trace the wireless signal emitted from an Internet user’s computer to obtain his location. The court concluded that the user did not enjoy a reasonable expectation of privacy in his computer’s wireless signal because he voluntarily caused his computer to emit the signal to a third party, the owner of the wireless modem. Therefore, the police officer’s search for the source of the wireless signal did not constitute a search in violation of the Fourth Amendment.