What if the person follows a form of religious extremism and works for a nuclear facility in a developing country? Here is a WSJ article about the above question:
RAWALPINDI, Pakistan -- Inside Pakistan's nuclear program, scientists are allowed to grow long beards, pray five times a day and vote for this country's conservative Islamist politicians. Religious zeal doesn't bar them from working in top-secret weapons facilities.
But religious extremism does. It's up to the program's internal watchdog, a security division authorized to snoop on its employees, to determine the difference -- and drive out those who breach the boundaries.
In an interview, a top security official for Pakistan's nuclear program outlined a multilayered system put in place over the past two years to try to avoid the kind of devastating lapses uncovered in recent years. A series of rogue scientists were found to have sold secrets or met with al Qaeda leaders, finally spurring a screening-and-surveillance program along the lines the U.S. uses -- but with a greater focus on weeding out an increasingly religious generation of would-be scientists and engineers...
The following is one of the most astonishing parts of the article. It's easy to forget that many countries have large disconnects between their civilian governments and the military:
...A major early problem [of protecting Pakistan's nuclear weapons] was weak oversight from the civilian government. Mr. Bhutto's daughter, Benazir, helped craft Pakistan's nuclear policies on exports and deterrence, yet says she was mostly kept out of the loop by the country's intelligence services while she was prime minister. Her successor, Nawaz Sharif -- who like Ms. Bhutto recently returned to Pakistan to challenge Mr. Musharraf's rule -- didn't fare any better during his two terms in office. At a 1999 meeting with President Clinton in Washington, Mr. Sharif says in an interview, U.S. intelligence informed him that Pakistani military transport planes were carrying used nuclear centrifuges, which can be used to produce weapons-grade uranium, out of the country.
"No, no," Mr. Sharif recalls responding. "That couldn't happen." But before he could check out the allegations, he says, his government fell in Gen. Musharraf's military coup. A former director of the centrifuge program was later arrested...
Read the rest
here.