IP addresses are routinely subpoenaed. Ask the operator of any popular file sharing site how many subpoenas they get from copyright lawyers. Some large ISPs have entire departments dedicated to servicing subpoenas from law enforcement.<p>Just because you used Tor doesn&#x27;t make your IP address invulnerable to subpoena.<p>If I connect through 7 proxies and do something illegal, my IP is no less subject to subpoena than if I weren&#x27;t to use a proxy at all.<p>If I stand in my front yard, in view of my neighbors, put on a mask, then I go rob a store, wearing that same mask, I don&#x27;t have a reasonable expectation of privacy as to my identity while wearing the mask.<p>This case is far less controversial than the recent one where the FBI hacked all the pervert&#x27;s computers. It may be an issue of ethics at CMU, but, not an issue with 4th&#x2F;5th amendments.