Australia swimmers sorry for pre-Games 'bonding' session
Members of Australia's Olympic swimming team said they used the sleeping medication Stilnox during a "bonding" session before the Games last year.
The six male athletes also said they engaged in disruptive behaviour.
Daniel Kowalski, CEO of Australian Swimmers Association, made a statement to the media describing the incident.
James Magnussen said he felt under pressure in the build-up to the Olympics and wanted to be "normal" for one night.
Eamon Sullivan said he was sorry that as a senior member of the team he had not shown more leadership.
Swimming Australia said the swimmers would face an inquiry panel.