NPR reports the US and Russia are allowing the Nuclear Cities Initiative to expire. This is a program designed to secure Russian nuclear weapons and help nuclear scientists transition to other jobs. This calls into question just how much commitment there is to stopping the spread of WMD's.
There were approximately 35,000 scientists in the program. A recent survey of biological & chemical weapons scientists revealed a disturbing willingness to sell their expertise to rogue states. The survey also noted that the mean monthly income for scientist in these programs was $110.