It seems that after looking at 20 years of space flight including:

• approximately 90 interviews with participants and witnesses to the last few days before shuttle and Soyuz launches, including current and former astronauts, flight surgeons, research and operations support nurses, shuttle suite technicians, closeout crew technicians and the managers and staff of crew quarters, including managers familiar with the crew quarters in Kazakhstan;
• a review of more than 40,000 records dating back to 1984, including mishap and close call reports, anonymous safety reports, safety hotline reports and disciplinary actions involving alcohol and drugs. These records cover 94 shuttle missions and 10 Soyuz missions;a review of relevant policies, procedures and near-launch timelines and staffing; and
• an inspection of crew quarters at Johnson Space Center in Houston and the Kennedy Space Center in Florida.
• Interviews with 80 percent of active astronauts and all current operational flight surgeons.

NASA has found no evidence of Astronauts drinking before launching into space...was it really neccessary to have such a thorough investigation to see if people had had a couple before leaving Earth. I think i would need a stiff drink before leaving the world