Black Market Organs Mariana van Zeller investigates one of the darkest and most elusive black markets in the world-- the illicit trade in human organs. LSD LSD is booming because of the growing faith in its healing power. Mariana hunts for the elusive chemists responsible for making the world's supply. Ghost Guns Mariana is on a mission to expose how ghost guns — untraceable firearms built from kits bought online — are fueling violence across the country. Terrorist Oil Mariana embarks on a