Obama's Drone Rules Leave Unanswered Questions

President Barack Obama left plenty of ambiguity in new policy guidelines that he says will restrict how and when the U.S. can launch targeted drone strikes, leaving himself significant power over how and when the weapons can be deployed.

National security experts say it's imperative to leave some room in the guidelines given the evolving fight against terrorism. But civil rights advocates argue too little has been revealed about the program to ensure its legality.

An unclassified version of the newly established drone guidelines was made public Thursday.

The congressional Intelligence committees and Capitol Hill leadership have been briefed on the more detailed, classified policies. But because those documents are secret, there's no way of knowing how much more clarity they provide.