It's an impediment to medical research on ayahuasca's potential to treat mental health disorders.
"I'm not sure how comfortable I would have felt having the gold medal that everyone else in the world believed was not mine." Even eight years later, losing gold to Phelps still stings for Cavic.
"Into the River" has been banned because of its depiction of drug use and underage sex. But author Ted Dawe feels it's a worrying example of the power of the country's conservative agenda.