The ayahuasca concoction is drunk also by the medicine-man himself, to produce a trance supposed to enable him to do such things as settle a dispute or quarrel, discover robbers, tell if strangers are approaching, give proper answer to an envoy from another tribe, discover the plans of an enemy, discover if wives are unfaithful, or, in the case of a sick man, to tell who bewitched him. The ayahuasca narcotic, which is similar in its effects to both opium and henbane (although botanically it is very different from either), does not seem to have been studied by toxicologists.