A NASA panel reviewing astronaut health issues has found that on at least two occasions astronauts were allowed to fly after flight surgeons and other astronauts warned they were so intoxicated that they posed a flight-safety risk.

The panel, also reported "heavy use of alcohol" by astronauts before launch, within the standard 12-hour "bottle to throttle" rule applied to NASA flight crew members.

A NASA spokesman declined comment on the findings, which were obtained by Aviation Week & Space Technology. The spokesman said a press conference has tentatively been scheduled for Friday afternoon on the issue.

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