Nearly 1,000 laptops go missing each week at Heathrow Airport in London. About the same amount as at LAX. And if some stranger doesn't take it, maybe the government will. Woe is you, if TSA decides your computer could use a closer look. Now federal authorities can seize your laptop for any reason - or none at all - rifle through its contents and not tell you a thing. They may not even give it back right away.