Wen Ho Lee inadvertently and intentionally gave Chinese scientists information on multiple occasions due to fears that he may lose his job; Lee viewed China as a potential source of employment and had to entice the Chinese until his position was cut.
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Lee states that he had downloaded the secrets to enhance his prospects of getting a job at scientific institutes in foreign countries.
Lee spent six weeks in Taiwan as a consultant to the Chung Shan Institute, a government military complex. He asked if he could access his classified computer while in Taiwan, and then proceeded to download unclassified computer code.
Lee could have actually been a hard spy, being enlisted as a Chinese asset years before, and ultimately providing the information that allowed China to improve their nuclear weapons.
Made a phone call to a nuclear scientist that was suspected of providing the original neutron bomb designs to China, offering to find who had "squealed" on the scientist.
Wen Ho Lee moved the information from a classified system to an open system, removed the "secret" classification, and copied it onto tapes on another employee's computer.
Transferred "Legacy Codes", which allow for computer simulations of warheads; China requires this because they rely on solely computer simulations for improvements to their nuclear arsenal.
Many of the information Lee copied was missing because he moved the information to portable computer tapes, which Lee claimed he threw in the trash bin near his desk; the investigators never found the tapes.