Dotnaught writes "Richard Carrigan, a particle physicist at the US Fermi National Accelerator Laboratory in Illinois, fears the Search for Extra-Terrestrial Intelligence (SETI) may be putting the earth at risk. As reported in the Guardian, Carrigan frets that alien radio signals could pose a security risk. The report cites a 2003 paper entitled "Do potential Seti signals need to be decontaminated?" but Carrigan's website has more details. Basically, he's calling for isolation of SETI computers and additional security measures. He writes, "To paraphrase Cocconi and Morrison for the possibility of a malevolent SETI signal ...the probability of a contaminated SETI signal is difficult to estimate; but if we never consider it the chance of infection is not zero."" Frankly, I'm more worried about some phishing malcontent then I am about the Grays, but maybe that's just me.