Clyde Mueller / AP. Leo Mascheroni and his wife Marjorie pose in their Los Alamos, N.M. home, in 1998. They were arrested Friday, Sept. 17, after an FBI sting operation and charged with conspiring to help develop a nuclear weapon for Venezuela. By TIM KORTE. updated 9/20/2010 2:43:16 PM ET 2010-09-20T18:43:16.