"Cabotegravir is still in pre-clinical trials but that hasn't stopped Four Thieves from trying to get pre-exposure prophylactics (PrEPs) into the hands of those who need it. As the group continues to experimenting with synthesizing its own cabotegravir, some Four Thieves affiliates have started purchasing a commercially available PrEP called tenofovir, compounding it with an inert buffer, and then providing it to heroin dealers who can choose to cut their product with the PrEP as a "service" for their customers. For those customers who decide to take the dealers up on their service, "their heroin has a new side effect,” Laufer said. “You don’t get HIV from it any more.”