NASA’s Plan For Unstable Astronauts: Duct Tape, Tranquilizers

CAPE CANAVERAL, Florida (AP) -- What would happen if an astronaut became mentally unstable in space and, say, destroyed the ship's oxygen system or tried to open the hatch and kill everyone aboard?

 http://www.cnn.com/2007/TECH/space/02/23/astronaut.plan.ap/