In the island of blue dolphins the author, Scott O'Dell uses this substance to capture wild dogs and made them fall asleep: The substance is called, xuchal. Three facts about this “drug”:
1. Xuchal is used as sleeping potions as some say. It is like a sleeping pill that makes you drowsy.
2. Xuchal is created from “ground up” sea shells and wild tobacco.
3. Sedation. Xuchal can cause someone to lose conscientious and “faint”, making them doze off.