First responders are being called to overdoses daily in Hawaii as fentanyl takes hold across the state. And stopping the drug pipeline won’t be easy, experts say.

To understand the crisis, HNN Investigates traveled to the U.S.-Mexico border as part of a new series exploring the heavy toll of fentanyl in the islands. Anthony Chrysanthis, the deputy special agent in charge of the DEA’s Los Angeles field office, said just about all of the fentanyl and methamphetamine in Hawaii are made in clandestine labs in Mexico run by the cartels.