An anonymous reader writes "The 9th Circuit Court of Appeals has ruled in the case of Jerome Heckenkamp, the former University of Wisconsin student convicted of federal computer crime charges in 2004 after hacking into Qualcomm, Cygnus Solutions and other companies, and defacing eBay. Heckenkamp was caught after a system administrator at the university hacked into his Linux box to gather evidence that Heckenkamp had been attacking the college mail server. The court ruled today that such counter-hacks are allowable under the 'special needs' exception to the Fourth Amendment, and upheld the warrantless search."
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