Mariana van Zeller explores the complex inner-workings of the global underworld, black and informal markets on National Geographic's Trafficked | National Geographic Africa

In 2018 alone, the U.S. had over 31,000 overdoses from synthetic opioids like fentanyl. But what makes fentanyl so dangerous? Trafficked With Mariana van Zeller premieres Wednesday Dec 2 at 9/8c on National Geographic. | National Geographic TV

Like a practiced chef, this fentanyl chemist relies on his own senses, rather than precise measurements, to create a batch of black market fentanyl. Trafficked with Mariana van Zeller starts tomorrow night at 9/8c on National Geographic. | National Geographic TV