Interviews with civilian and military figures paint a complex picture of what went wrong with crucial peace negotiations.
Without a strategy or a legal case to legitimate the use of force, the US is endangering crucial alliances and civilian lives.
It hinges upon whether she was a member of IS, and what that means.
If Trump becomes president, he'll inherit one of the US's most dangerous military tools.
Attempts to outlaw the practice have proven difficult, thanks to a tendency on the part of leaders to skirt around the rules.
Technology poses a challenge to how we treat suspects and police society.