Decaying fish line the banks of the Klipvoor Dam. It might look like a free meal for cormorants and fish eagles, but the dam – once home to hundreds of indigenous fish species – has become dangerously polluted. New research shows that the Apies River, which flows from Pretoria into the dam, is full of pharmaceutical drugs including antidepressants, as well as cocaine and tik. But that hasn’t stopped criminal syndicates from poaching the fish and selling it for human consumption. Now, unsuspecting consumers are eating fish that could pose serious health risks. Carte Blanche joins an anti-poaching unit on patrol. Producer: Anina Peens | Presenter: Macfarlane Moleli