The Obama administration's
policy on drone strikes
requires "near certainty" that civilians won't be killed. Jon Stewart does the math — and gives the U.S. a "gentleman's D" on the drone strike report card.
Plus: Terrorists-in-training accidentally
, Conan O'Brien says Republicans want the 2007 health-care reform called "Bushcare," and Obama's
trip to Mexico
leads to the announcement that the U.S. is ending its dependency on foreign weed, David Letterman reports.