CNN’s award winning journalist, Lisa Ling goes to the heart of Peru to learn about the healing powers of Ayahuasca. She meets with American soldiers suffering from PTSD, attends two ceremonies, and discusses the experiences with the participants. Former Marine Lance Cpl. Ryan LeCompte organizes trips to Peru for war veterans, like himself, who are seeking ayahuasca as a possible treatment for PTSD and other emotional and mental trauma suffered after multiple combat deployments.

“Ayahuasca is...