The Amsterdam court, which sentenced the father of Pakistan's nuclear program Dr Abdul Qadeer Khan to four years in prison in 1983, has lost the legal files, and the court's vice-president suspects that CIA had a hand in the documents' disappearance.
"Something is not right; we just don't lose things like that," Judge Anita Leeser told Dutch news show NOVA on Friday.
"I find it bewildering that people lose files with a political goal, especially if it is on request of the CIA. It is unheard of," she added.
Qadeer, who admitted in 2004 that he had leaked nuclear secrets to Iran, North Korea and Libya, worked as an engineer in the Netherlands at Urenco, a uranium enrichment plant, in the 1970s.
In 1983, he was sentenced, in absentia, by Judge Leeser, to four years in prison for stealing nuclear secrets about uranium enrichment. On appeal, the verdict was quashed because of procedural errors, and the Dutch government did not pursue the matter any further.
A month ago, a former Dutch prime minister, Ruud Lubbers said Qadeer was let go at the request of US intelligence services.
Leeser said that when she heard Lubbers, the disappearance of Qadeer's files at the Amsterdam court's archive fell into place for her.
She has asked to see the Khan case files several years ago but they had disappeared from the archives.
"Now I think somebody lost the files on purpose ... I think that there was some political influence at play, nationally and internationally," she said.