During a trial of the former heads of the national blood bank and of blood transfusion research last year, many medical experts and former Government officials contended that they were not initially aware of the risks posed by existing blood stocks and that commercial considerations never took precedence over the AIDS emergency.

But the new documents published by Liberation this week suggest otherwise. One letter dated Jan. 14, 1985, from Francois Gros, science adviser to Laurent Fabius, then the Prime Minister, noted that AIDS "no longer affects only groups at risk but can also infect accident victims or anybody who is operated on and is given a transfusion."

Other letters among top Government officials also refer to the need for Diagnostics Pasteur, a commercial affiliate of the Pasteur Institute, to accelerate work on its own blood-screening test. In a memorandum dated April 30, 1985, Mr. Gros noted that approval of the Abbott test could still be delayed "for some time."

But evidence also emerges of a link between the competing tests. In still another letter dated July 3, 1985, Mr. Gros warned Louis Schweitzer, Mr. Fabius's chief of staff, of "the risk" that the Abbott test would soon "flood the French market since we will no longer be able to delay for long the recognition of this test by the National Health Laboratory."

These and other documents now seem certain to bring complications for Mr. Fabius as well as his former Health Minister, Edmond Herve, and his former Social Affairs Minister, Georgina Dufoix, who apparently all attended meetings at which the delay in approval of the Abbott test was discussed.