Amended from Mobile Magazine:

A Sacramento area teenager got busted last month for hacking into his school's computer system and changing his grades. When the police searched his home, they found a number of Pringles-can antennas -- the aluminum foil-lined devices that many people use to amplify Wi-Fi signals or to pull in Wi-Fi signals from afar. "They're unsophisticated but reliable, and it's illegal to possess them," said Lt. Bob Lozito of the Sacramento Valley Hi-Tech Crimes Task Force. Cantennas are now illegal to possess? That's news to us. It's illegal to amplify a Wi-Fi signal (if you do so, you'll run afoul of FCC regulations) but this is the first we've heard of homemade high-gain antennas being outlawed.