Left-wing President Evo Morales, a coca-grower himself, has made coca validation a personal quest, chewing leaves in front of world leaders and press cameras during his travels.

• 左翼总统莫拉莱斯，他自己是一个古柯种植者，并且取得了个人的古柯碱合法证，他旅行期间在世界各国领导人和新闻相机面前嚼树叶。