"Given the recent problems Lisa Nowak experienced - problems that emerged only months after she flew on a Space Shuttle mission - questions have arisen as to how NASA might deal with an individual who exhibited problems during a mission - as well as how to catch such problems on the ground ahead of time.
The following interview was conducted with NASA's Chief Safety and Mission Assurance Officer, astronaut Bryan O'Connor in April 2006 - a few months before Lisa Nowak's space shuttle mission to the International Space Station. As such, his thoughts certainly represent his recent thinking about safety.
As such, it is somewhat disconcerting to read a recollection wherein O'Connor talks about adding a combination lock to Space Shuttle Columbia's middeck hatch on STS-40 in 1991 due to concerns over the competency of several payload specialists. Moreover, he repeats several times that he thought this whole story was "humorous" and "funny"."