Doctors: would you respond to an in-flight emergency without your instruments handy? Cimmerian/iStockphoto hide caption

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In this Jan. 5, 2011 file photo, Rep. Gabrielle Giffords, D-Ariz., takes part in a reenactment of her swearing-in, on Capitol Hill in Washington. Susan Walsh/AP hide caption

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Associate Attorney General Tom Perrelli fields questions during a 2009 news conference about Pfizer agreeing to pay $2.3 billion in penalties over unlawful prescription drug promotion. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP