He has been working for over 15 years with traditional medicinal plants recognised as sacred plants or power plants within Mesoamerican cultures. He is a spokesman for the message of the councils of elders of indigenous communities in northern Mexico. He has been entrusted by the Seri tribe to communicate their message and spread their traditions and understanding. Dr. Rettig’s sessions incorporate ancient healing chants with the experience of the Sonoran Desert Toad (which contains 5-MeO-DMT). He has worked with the toad medicine for over seven years, during which he has given over 3,500 sessions treating serious cases of addiction to strong synthetic drugs like crystal meth (methamphetamine), and crack cocaine, achieving a high success rate with his patients, providing them with a new way of understanding life.