The Electronic Frontier Foundation and Asian Law Caucus, two civil liberties groups in San Francisco, [have filed] a lawsuit to force the government to disclose its policies on border searches, including which rules govern the seizing and copying of the contents of electronic devices. They also want to know the boundaries for asking travelers about their political views, religious practices and other activities potentially protected by the First Amendment. The lawsuit was inspired by two dozen cases, 15 of which involved searches of cellphones, laptops, MP3 players and other electronics. Almost all involved travelers of Muslim, Middle Eastern or South Asian background. "It's one thing to say it's reasonable for government agents to open your luggage," said David D. Cole, a law professor at Georgetown University. "It's another thing to say it's reasonable for them to read your mind and everything you have thought over the last year. What a laptop records is as personal as a diary but much more extensive. It records every Web site you have searched. Every e-mail you have sent. It's as if you're crossing the border with your home in your suitcase." Mark Rasch, a technology security expert with FTI Consulting and a former federal prosecutor, [said] "Your kid can be arrested because they can't prove the songs they downloaded to their iPod were legally downloaded," he said. "Lawyers run the risk of exposing sensitive information about their client. Trade secrets can be exposed to customs agents with no limit on what they can do with it. Journalists can expose sources, all because they have the audacity to cross an invisible line."