meanwhile, in brazil's maranhao state, indigenous communities have formed citiz patrols t protect the forest from tree poachers. [indistinct chatter] announcer: "earth focus" is made possible in part by a grant from anne ray foundation, a margaret a. cargill philanthropy; the orange county community foundation; and the farvue foundation. cordero-lamb: i think there really is something to using the medicines that your ancestors have been using for a really long time. i think our bodies remember a lot, not just trauma. i think our bodies remember medicine. i think our bodies remember knowledge. i think they remember places. >> one of the most dangerous aspects of the new drug addiction is that the drugs abused are legally sanctioned, mass-produced, and available everywhere. cordero-lamb: that whole idea--"if it's more expensive, it's better"-- that is really something that we've brought into our whole mindset as western consumers. you spend more ney on it, surely it will work better, a if you take twice as much of it, it'll work even better, so we've got this "bigger, better, faster" mi