Raymond Davis, a CIA agent, sits in a Pakistani jail while the US worries that extraordinary security might not be enough to keep him alive. The US claims Raymond Davis killed two men in self-defense during an attempted robbery. A Pakistani police report says one man was shot in the back. President Obama says he’s entitled to diplomatic immunity. But Pakistan’s President Zardari is under public pressure to hang him for murder. Pakistan claims Davis is being held under extraordinary security. But Pakistan is a country where a security guard recently shot and killed the provincial governor he was supposed to protect. The case raises a host of issues, including: competition between US and Pakistani intelligence agencies; Congressional frustration with foreign aid; and Pakistan’s buildup of its nuclear arsenal.